[ci-skip] [DEV] Add 1.21.5 to LTS

1.21.5/changelog.md

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+**Bug Fixes**:
+
+- Fixed LuckPerms breaking commands on Paper
+- Fix Config watcher using too many threads and not detecting changes on Linux systems
+
+**New Features**:
+
+- Added Nojang API to allow mods to access GameRules (SDLink)
+- Exposed Adventure JSON serializer to mods
+
+**Dev Changes**:
+
+- Bumped MoonConfig - `1.0.10` -> `1.0.12`