Bump log4j-core from 2.14.0 to 2.17.1

Bumps log4j-core from 2.14.0 to 2.17.1.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index fec112e..08fa512 100644
--- a/pom.xml
+++ b/pom.xml
@@ -28,7 +28,7 @@
         <apache.common.lang.ver>3.11</apache.common.lang.ver>
         <commons.validator.ver>1.7</commons.validator.ver>
         <gson.ver>2.8.6</gson.ver>
-        <log4j.ver>2.14.0</log4j.ver>
+        <log4j.ver>2.17.1</log4j.ver>
         <nlpcraft.ver>0.9.0</nlpcraft.ver>
         <junit.ver>5.7.0</junit.ver>
         <maven.compiler.version>3.8.0</maven.compiler.version>