update flexmark to 0.61.26
diff --git a/pom.xml b/pom.xml
index 25949f9..f2a6add 100644
--- a/pom.xml
+++ b/pom.xml
@@ -52,7 +52,7 @@
     <commons-lang.version>3.10</commons-lang.version>

     <commons-text.version>1.8</commons-text.version>

     <ehcache.version>2.10.6</ehcache.version>

-    <flexmark.version>0.61.16</flexmark.version>

+    <flexmark.version>0.61.26</flexmark.version>

     <freshcookies-security.version>0.60</freshcookies-security.version>

     <gson.version>2.8.5</gson.version>

     <hsqldb.version>2.5.0</hsqldb.version>