[3.12] gh-132134: Add the clangd .cache directory to .gitignore (GH-132135) (#132145)

gh-132134: Add the clangd ``.cache`` directory to ``.gitignore`` (GH-132135)
(cherry picked from commit 8680400)

Signed-off-by: Manjusaka <[email protected]>
Co-authored-by: Nadeshiko Manju <[email protected]>

Author: miss-islington

.gitignore

@@ -38,6 +38,7 @@ tags
 TAGS
 .vs/
 .vscode/
+.cache/
 gmon.out
 .coverage
 .mypy_cache/