chore(deps)(deps): bump tree-sitter-dart from 0.1.0 to 0.2.0 in /diffctx (#63)

Bumps [tree-sitter-dart](https://github.com/nielsenko/tree-sitter-dart) from 0.1.0 to 0.2.0.
- [Changelog](https://github.com/nielsenko/tree-sitter-dart/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nielsenko/tree-sitter-dart/commits/v0.2.0)

---
updated-dependencies:
- dependency-name: tree-sitter-dart
  dependency-version: 0.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

diffctx/Cargo.lock

@@ -101,7 +101,7 @@ tree-sitter-make = { version = "1.1", optional = true }
 tree-sitter-hcl = { version = "1.1", optional = true }
 tree-sitter-clojure = { version = "0.1", optional = true }
 tree-sitter-graphql = { version = "0.1", optional = true }
-tree-sitter-dart = { version = "0.1", optional = true }
+tree-sitter-dart = { version = "0.2", optional = true }
 tree-sitter-prisma-io = { version = "1.6", optional = true }
 tree-sitter-svelte-ng = { version = "1.0", optional = true }
 tiktoken-rs = "=0.12.0"