Bump tree-sitter from 0.20.10 to 0.21.0

Bumps [tree-sitter](https://github.com/tree-sitter/tree-sitter) from 0.20.10 to 0.21.0.
- [Release notes](https://github.com/tree-sitter/tree-sitter/releases)
- [Changelog](https://github.com/tree-sitter/tree-sitter/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tree-sitter/tree-sitter/commits/v0.21.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -12,7 +12,7 @@ topiary-core = { git = "https://github.com/tweag/topiary.git", version = "0.3.0"
 topiary-tree-sitter-facade = { git = "https://github.com/tweag/topiary.git", version = "0.3.0" }
 tree-sitter-facade = { git = "https://github.com/tweag/tree-sitter-facade" }
 clap = { version = "4.5.1", features = ["std", "derive", "help"], default-features = false }
-tree-sitter = "0.20.10"
+tree-sitter = "0.21.0"
 thiserror = "1.0.57"
 miette = { version = "7.1.0", default-features = false, features = ["derive", "fancy"] }