Bump tree-sitter from 0.20.8 to 0.20.9 in /ql

Bumps [tree-sitter](https://github.com/tree-sitter/tree-sitter) from 0.20.8 to 0.20.9.
- [Release notes](https://github.com/tree-sitter/tree-sitter/releases)
- [Commits](https://github.com/tree-sitter/tree-sitter/commits)

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

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

Author: dependabot[bot]