IBANValidator : add Falkland Islands, Mongolia, Nicaragua, Oman, Somalia (#209)

* add IBANValidator for Falkland Islands, since Jul-23,

Mongolia, Nicaragua, Oman, Somalia

published in IBAN REGISTRY Release 97 – Mar 2024

* IBANValidator Test with examples from IBAN REGISTRY Release 97

the examples for Nicaragua is buggy - I've changed the check digit
diff --git a/src/main/java/org/apache/commons/validator/routines/IBANValidator.java b/src/main/java/org/apache/commons/validator/routines/IBANValidator.java
index 4db944d..aa6136c 100644
--- a/src/main/java/org/apache/commons/validator/routines/IBANValidator.java
+++ b/src/main/java/org/apache/commons/validator/routines/IBANValidator.java
@@ -147,6 +147,7 @@
             new Validator("EG", 29, "EG\\d{27}"),                             // Egypt
             new Validator("ES", 24, "ES\\d{22}"),                             // Spain
             new Validator("FI", 18, "\\d{16}", "AX"),                         // Finland
+            new Validator("FK", 18, "FK\\d{2}[A-Z]{2}\\d{12}"),               // Falkland Islands, since Jul-23
             new Validator("FO", 18, "FO\\d{16}"),                             // Faroe Islands
             new Validator("FR", 27, "\\d{12}[A-Z0-9]{11}\\d{2}", "GF", "GP", "MQ", "RE", "PF", "TF", "YT", "NC", "BL", "MF", "PM", "WF"), // France
             new Validator("GB", 22, "\\d{2}[A-Z]{4}\\d{14}", "IM", "JE", "GG"), // United Kingdom
@@ -176,11 +177,14 @@
             new Validator("MD", 24, "MD\\d{2}[A-Z0-9]{20}"),                  // Moldova
             new Validator("ME", 22, "ME\\d{20}"),                             // Montenegro
             new Validator("MK", 19, "MK\\d{5}[A-Z0-9]{10}\\d{2}"),            // Macedonia
+            new Validator("MN", 20, "MN\\d{18}"),                             // Mongolia, since Apr-23
             new Validator("MR", 27, "MR\\d{25}"),                             // Mauritania
             new Validator("MT", 31, "MT\\d{2}[A-Z]{4}\\d{5}[A-Z0-9]{18}"),    // Malta
             new Validator("MU", 30, "MU\\d{2}[A-Z]{4}\\d{19}[A-Z]{3}"),       // Mauritius
+            new Validator("NI", 28, "NI\\d{2}[A-Z]{4}\\d{20}"),               // Nicaragua, since Apr-23
             new Validator("NL", 18, "NL\\d{2}[A-Z]{4}\\d{10}"),               // Netherlands (The)
             new Validator("NO", 15, "NO\\d{13}"),                             // Norway
+            new Validator("OM", 23, "OM\\d{5}[A-Z0-9]{16}"),                  // Oman, since Mar-24
             new Validator("PK", 24, "PK\\d{2}[A-Z]{4}[A-Z0-9]{16}"),          // Pakistan
             new Validator("PL", 28, "PL\\d{26}"),                             // Poland
             new Validator("PS", 29, "PS\\d{2}[A-Z]{4}[A-Z0-9]{21}"),          // Palestine, State of
@@ -188,7 +192,7 @@
             new Validator("QA", 29, "QA\\d{2}[A-Z]{4}[A-Z0-9]{21}"),          // Qatar
             new Validator("RO", 24, "RO\\d{2}[A-Z]{4}[A-Z0-9]{16}"),          // Romania
             new Validator("RS", 22, "RS\\d{20}"),                             // Serbia
-            new Validator("RU", 33, "RU\\d{31}"),                             // Russia
+            new Validator("RU", 33, "RU\\d{16}[A-Z0-9]{15}"),                 // Russia
             new Validator("SA", 24, "SA\\d{4}[A-Z0-9]{18}"),                  // Saudi Arabia
             new Validator("SC", 31, "SC\\d{2}[A-Z]{4}\\d{20}[A-Z]{3}"),       // Seychelles
             new Validator("SD", 18, "SD\\d{16}"),                             // Sudan
@@ -196,6 +200,7 @@
             new Validator("SI", 19, "SI\\d{17}"),                             // Slovenia
             new Validator("SK", 24, "SK\\d{22}"),                             // Slovakia
             new Validator("SM", 27, "SM\\d{2}[A-Z]{1}\\d{10}[A-Z0-9]{12}"),   // San Marino
+            new Validator("SO", 23, "SO\\d{21}"),                             // Somalia, since Feb-23
             new Validator("ST", 25, "ST\\d{23}"),                             // Sao Tome and Principe
             new Validator("SV", 28, "SV\\d{2}[A-Z]{4}\\d{20}"),               // El Salvador
             new Validator("TL", 23, "TL\\d{21}"),                             // Timor-Leste
diff --git a/src/test/java/org/apache/commons/validator/routines/IBANValidatorTest.java b/src/test/java/org/apache/commons/validator/routines/IBANValidatorTest.java
index e844988..3e823fe 100644
--- a/src/test/java/org/apache/commons/validator/routines/IBANValidatorTest.java
+++ b/src/test/java/org/apache/commons/validator/routines/IBANValidatorTest.java
@@ -90,6 +90,7 @@
               // FI other
               "AX2112345600000785", // FI other
               "AX5542345670000081", // FI other
+            "FK88SC123456789012",
             "FO6264600001631634",
             "FR1420041010050500013M02606",
               // FR 'other'
@@ -137,11 +138,14 @@
             "MD24AG000225100013104168",
             "ME25505000012345678951",
             "MK07250120000058984",
+            "MN121234123456789123",
             "MR1300020001010000123456753",
             "MT84MALT011000012345MTLCAST001S",
             "MU17BOMM0101101030300200000MUR",
+            "NI45BAPR00000013000003558124",
             "NL91ABNA0417164300",
             "NO9386011117947",
+            "OM810180000001299123456",
             "PK36SCBL0000001123456702",
             "PL61109010140000071219812874",
             "PS92PALS000000000400123456702",
@@ -158,6 +162,7 @@
             "SI56263300012039086",
             "SK3112000000198742637541",
             "SM86U0322509800000000270100",
+            "SO211000001001000100141",
             "ST68000100010051845310112",
             "SV62CENR00000000000000700025",
             "SV43ACAT00000000000000123123",