Release v4.1

What's Changed

• KPMP-5209_upgrade-to-java21 by @Dert1129 in #29
• Update build.gradle by @HaneenT in #28
• Create changelog.md by @rlreamy in #30
• Release v4.1 by @rlreamy in #31

New Contributors

• @HaneenT made their first contribution in #28

Full Changelog: v4.0...v4.1