Update log4j2 monorepo to v2.26.0 (#1135)

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

Author: renovate[bot]

build.gradle

@@ -33,7 +33,7 @@ def versions = [
   junit              : '6.0.0',
   junitPlatform      : '6.0.0',
   jackson            : '2.20.1',
-  log4j              : '2.25.2',
+  log4j              : '2.26.0',
   logback            : '1.5.20',
   logstashEncoder    : '8.1',
   feign              : '3.8.0',