Bump antlr4ng from 3.0.14 to 3.0.15

Bumps [antlr4ng](https://github.com/mike-lischke/antlr4ng) from 3.0.14 to 3.0.15.
- [Release notes](https://github.com/mike-lischke/antlr4ng/releases)
- [Changelog](https://github.com/mike-lischke/antlr4ng/blob/main/release-notes.md)
- [Commits](mike-lischke/antlr4ng@v3.0.14...v.3.0.15)

---
updated-dependencies:
- dependency-name: antlr4ng
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>