Use __future__ imports in scripts (#5301)

scripts/check_docs_formatted.py

@@ -1,17 +1,22 @@
 #!/usr/bin/env python3
 """Check code snippets in docs are formatted by black."""
+from __future__ import annotations
+
 import argparse
 import os
 import re
 import textwrap
-from collections.abc import Sequence
 from pathlib import Path
 from re import Match
+from typing import TYPE_CHECKING
 
 import black
 from black.mode import Mode, TargetVersion
 from black.parsing import InvalidInput
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 TARGET_VERSIONS = ["py37", "py38", "py39", "py310", "py311"]
 SNIPPED_RE = re.compile(
     r"(?P<before>^(?P<indent> *)```\s*python\n)"