fix: upgrade org.slf4j:log4j-over-slf4j from 1.7.30 to 1.7.31

Snyk has created this PR to upgrade org.slf4j:log4j-over-slf4j from 1.7.30 to 1.7.31.

See this package in Maven Repository:
https://mvnrepository.com/artifact/org.slf4j/log4j-over-slf4j/

See this project in Snyk:
https://app.snyk.io/org/ketola/project/48aa5b49-a8c3-484d-8441-4d6add437a2b?utm_source=github&utm_medium=upgrade-pr

pom.xml

@@ -35,7 +35,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>11</maven.compiler.source>
     <maven.compiler.target>11</maven.compiler.target>
-    <slf4j.version>1.7.30</slf4j.version>
+    <slf4j.version>1.7.31</slf4j.version>
     <log4j.version>2.13.3</log4j.version>
   </properties>