Use local repository for integration tests instead of remote v1.3.4

Integration tests were using the remote repository at v1.3.4, which meant
they were testing old code and not reflecting any changes made to the
local codebase. This explains why iwyu integration tests kept failing -
they were testing an old version that didn't have the compile_commands.json
fixes.

Changed to use the local repository root at HEAD so integration tests
actually test the current code being developed.

Author: pocc

tests/test_utils.py

@@ -121,10 +121,12 @@ def integration_test(cmd_name, files, args, test_dir):
     run_in(["git", "add"] + files + [compile_db], test_dir)
     args = list(args)  # redeclare so there's no memory weirdness
     pre_commit_config_path = os.path.join(test_dir, ".pre-commit-config.yaml")
+    # Use local repository to test current code, not remote v1.3.4
+    repo_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
     pre_commit_config = f"""\
 repos:
-- repo: https://github.com/pocc/pre-commit-hooks
-  rev: v1.3.4
+- repo: {repo_root}
+  rev: HEAD
   hooks:
     - id: {cmd_name}
       args: {args}