Remove git_commit syntax highlighting from core Zed (#9025)

Fallback to extension
https://github.com/zed-industries/extensions/pull/307

Release Notes:

- Remove git_commit syntax highlighting from Zed core, `git-firefly` extension replaced that

Co-authored-by: William Desportes <williamdes@wdes.fr>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

Cargo.lock

@@ -5355,7 +5355,6 @@ dependencies = [
  "tree-sitter-elm",
  "tree-sitter-embedded-template",
  "tree-sitter-erlang",
- "tree-sitter-gitcommit",
  "tree-sitter-gleam",
  "tree-sitter-glsl",
  "tree-sitter-go",
@@ -10555,15 +10554,6 @@ dependencies = [
  "tree-sitter",
 ]
 
-[[package]]
-name = "tree-sitter-gitcommit"
-version = "0.3.3"
-source = "git+https://github.com/gbprod/tree-sitter-gitcommit#7c01af8d227b5344f62aade2ff00f19bd0c458ca"
-dependencies = [
- "cc",
- "tree-sitter",
-]
-
 [[package]]
 name = "tree-sitter-gleam"
 version = "0.34.0"