Update log4j2 monorepo to v2.26.0 (#414)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -65,7 +65,7 @@
         <tlib.version>2.3</tlib.version>
         <!-- dependencies -->
         <struts2.version>7.1.1</struts2.version>
-        <log4j2.version>2.25.4</log4j2.version>
+        <log4j2.version>2.26.0</log4j2.version>
         <velocity.version>1.7</velocity.version>
         <freemarker.version>2.3.34</freemarker.version>
     </properties>