build(deps): bump tree-sitter-c from 0.20.2 to 0.20.6

Bumps [tree-sitter-c](https://github.com/tree-sitter/tree-sitter-c) from 0.20.2 to 0.20.6.
- [Release notes](https://github.com/tree-sitter/tree-sitter-c/releases)
- [Commits](tree-sitter/tree-sitter-c@v0.20.2...v0.20.6)

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

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