Pin tree-sitter at git master (#6218)

Tree-sitter has some unreleased improvements that can speed up small
queries and prevent hangs due to error recovery in some parsers. This
change pins tree-sitter to the latest master.

Neovim also pins tree-sitter to a commit on master.

Cargo.lock

@@ -2154,8 +2154,7 @@ dependencies = [
 [[package]]
 name = "tree-sitter"
 version = "0.20.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/tree-sitter/tree-sitter?rev=c51896d32dcc11a38e41f36e3deb1a6a9c4f4b14#c51896d32dcc11a38e41f36e3deb1a6a9c4f4b14"
-checksum = "d4423c784fe11398ca91e505cdc71356b07b1a924fc8735cfab5333afe3e18bc"
 dependencies = [
  "cc",
  "regex",

Cargo.toml

@@ -31,3 +31,6 @@ inherits = "test"
 package.helix-core.opt-level = 2
 package.helix-tui.opt-level = 2
 package.helix-term.opt-level = 2
+
+[patch.crates-io]
+tree-sitter = { git = "https://github.com/tree-sitter/tree-sitter", rev = "c51896d32dcc11a38e41f36e3deb1a6a9c4f4b14" }