Enable nearly all pyupgrade rules (except on test cases)

pyproject.toml

@@ -27,6 +27,7 @@ exclude = [
 select = [
     "FA", # flake8-future-annotations
     "I", # isort
+    "UP", # pyupgrade
     # Only enable rules that have safe autofixes:
     "F401", # Remove unused imports
     "PYI009", # use `...`, not `pass`, in empty class bodies
@@ -39,14 +40,21 @@ select = [
     "PYI032", # use `object`, not `Any`, as the second parameter to `__eq__`
     "PYI055", # multiple `type[T]` usages in a union
     "PYI058", # use `Iterator` as the return type for `__iter__` methods
-    "UP004", # Remove explicit `object` inheritance
-    "UP006", # PEP-585 autofixes
-    "UP007", # PEP-604 autofixes
-    "UP013", # Class-based syntax for TypedDicts
-    "UP014", # Class-based syntax for NamedTuples
-    "UP019", # Use str over typing.Text
-    "UP035", # import from typing, not typing_extensions, wherever possible
-    "UP039", # don't use parens after a class definition with no bases
+]
+ignore = [
+    # Slower and more verbose https://github.com/astral-sh/ruff/issues/7871
+    "UP038", # Use `X | Y` in `isinstance` call instead of `(X, Y)`
+]
+
+[tool.ruff.lint.per-file-ignores]
+# Disable "modernization" rules with autofixes from test cases as they often
+# deliberately contain code that might not be considered idiomatic or modern
+# These can be run manually once in a while
+"**/test_cases/**/*.py" = ["UP"]
+# Generated protobuf files:
+# TODO: Re-run sync_tensorflow_protobuf_stubs.sh with this rule enabled to remove this entry
+"*_pb2.pyi" = [
+    "UP036", # Version block is outdated for minimum Python version
 ]
 
 [tool.ruff.lint.isort]

stubs/six/six/moves/builtins.pyi

@@ -1 +1,4 @@
-from builtins import *
+# flake8: noqa: NQA102 # https://github.com/plinss/flake8-noqa/issues/22
+# six explicitly re-exports builtins. Normally this is something we'd want to avoid.
+# But this is specifically a compatibility package.
+from builtins import *  # noqa: UP029