Update org.codehaus.groovy:groovy-bom to version 3.0.21 (#2345)

Author: asf-rm

log4j-parent/pom.xml

@@ -84,7 +84,7 @@
     <flapdoodle-embed.version>4.9.0</flapdoodle-embed.version>
     <flapdoodle-reverse.version>1.7.2</flapdoodle-reverse.version>
     <flume.version>1.11.0</flume.version>
-    <groovy.version>3.0.20</groovy.version>
+    <groovy.version>3.0.21</groovy.version>
     <guava.version>33.0.0-jre</guava.version>
     <h2.version>2.2.224</h2.version>
     <hadoop.version>1.2.1</hadoop.version>

src/changelog/.2.x.x/update_org_codehaus_groovy_groovy_bom.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="http://logging.apache.org/log4j/changelog"
+       xsi:schemaLocation="http://logging.apache.org/log4j/changelog https://logging.apache.org/log4j/changelog-0.1.3.xsd"
+       type="updated">
+  <issue id="2345" link="https://github.com/apache/logging-log4j2/pull/2345"/>
+  <description format="asciidoc">Update `org.codehaus.groovy:groovy-bom` to version `3.0.21`</description>
+</entry>

src/site/_release-notes/_2.x.x.adoc

@@ -48,3 +48,4 @@ This releases contains ...
 * Update `org.apache.commons:commons-compress` to version `1.26.0` (https://github.com/apache/logging-log4j2/pull/2304[2304])
 * Update `org.apache.commons:commons-dbcp2` to version `2.12.0` (https://github.com/apache/logging-log4j2/pull/2344[2344])
 * Update `org.apache.kafka:kafka-clients` to version `3.7.0` (https://github.com/apache/logging-log4j2/pull/2326[2326])
+* Update `org.codehaus.groovy:groovy-bom` to version `3.0.21` (https://github.com/apache/logging-log4j2/pull/2345[2345])