chore: use if TYPE_CHECKING: blocks (#2866)

unit_test/linux_build_steps_test.py

@@ -1,13 +1,18 @@
-import textwrap
-from pathlib import Path
-from pprint import pprint
+from __future__ import annotations
 
-import pytest
+import textwrap
+from pprint import pprint
 
 import cibuildwheel.platforms.linux
 from cibuildwheel.oci_container import OCIContainerEngineConfig
 from cibuildwheel.options import CommandLineArguments, Options
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    import pytest
+
 
 def test_linux_container_split(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
     """