docs: update RELEASES.md
### Changed
- `java_indexer`: do not include Symbol modifiers in hashes (#3139)
- `javac_extractor`: migrate javac_extractor to use ambient langtools (#3093)
+ - `verifier`: recover file VNames using file content; reorder singleton checking (#3166)
### Deprecated
- Index packs and `.kindex` files have been deprecated in favor of `.kzip` files
