Bump org.apache.logging.log4j:log4j-core

Bumps the maven group with 1 update in the /java/ql/test/utils/flowtestcasegenerator directory: org.apache.logging.log4j:log4j-core.


Updates `org.apache.logging.log4j:log4j-core` from 2.14.1 to 2.25.4

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-version: 2.25.4
  dependency-type: direct:production
  dependency-group: maven
...

Signed-off-by: dependabot[bot] <support@github.com>

java/ql/test/utils/flowtestcasegenerator/pom.xml

@@ -26,7 +26,7 @@
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
-      <version>2.14.1</version>
+      <version>2.25.4</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>