STY: Enforce ruff/flake8-pyi rules (PYI)

Author: DimitriPapadopoulos

pyproject.toml

@@ -118,10 +118,12 @@ exclude = ["doc", "nibabel/externals", "tools", "version.py", "versioneer.py"]
 select = [
     "F",
     "I",
+    "PYI",
     "Q",
     "UP",
 ]
 ignore = [
+    "PYI024",
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
     "W191",
     "E111",