SYT: Apply ruff/pygrep-hooks rule PGH003

PGH003 Use specific rule codes when ignoring type issues

niworkflows/interfaces/conftest.py

@@ -9,7 +9,7 @@
     import os
     from contextlib import contextmanager
 
-    @contextmanager  # type: ignore
+    @contextmanager
     def _chdir(path):
         cwd = os.getcwd()
         os.chdir(path)