Bump tree-sitter from 0.25.10 to 0.26.8 in /codex-rs

Bumps [tree-sitter](https://github.com/tree-sitter/tree-sitter) from 0.25.10 to 0.26.8.
- [Release notes](https://github.com/tree-sitter/tree-sitter/releases)
- [Commits](tree-sitter/tree-sitter@v0.25.10...v0.26.8)

---
updated-dependencies:
- dependency-name: tree-sitter
  dependency-version: 0.26.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

codex-rs/Cargo.lock

@@ -401,7 +401,7 @@ tracing-subscriber = "0.3.22"
 tracing-test = "0.2.5"
 tonic = { version = "0.14.3", default-features = false, features = ["channel", "codegen"] }
 tonic-prost = "0.14.3"
-tree-sitter = "0.25.10"
+tree-sitter = "0.26.8"
 tree-sitter-bash = "0.25"
 ts-rs = "11"
 tungstenite = { version = "0.27.0", features = ["deflate", "proxy"] }