Update org.eclipse.platform:org.eclipse.osgi to version 3.21.0 (#2940)

Author: asf-rm

log4j-parent/pom.xml

@@ -120,7 +120,7 @@
     <maven.version>3.9.9</maven.version>
     <mockito.version>4.11.0</mockito.version>
     <nashorn.version>15.4</nashorn.version>
-    <org.eclipse.osgi.version>3.20.0</org.eclipse.osgi.version>
+    <org.eclipse.osgi.version>3.21.0</org.eclipse.osgi.version>
     <org.eclipse.persistence.version>2.7.15</org.eclipse.persistence.version>
     <oro.version>2.0.8</oro.version>
     <!-- The OSGi API version MUST always be the MINIMUM version Log4j supports: -->

src/changelog/.2.x.x/update_org_eclipse_platform_org_eclipse_osgi.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="updated">
+  <issue id="2940" link="https://github.com/apache/logging-log4j2/pull/2940"/>
+  <description format="asciidoc">Update `org.eclipse.platform:org.eclipse.osgi` to version `3.21.0`</description>
+</entry>