style(dev-python): fold the env filter onto one line after the rename

DEV_PYTHON_REQUIRES is shorter than the old name, so ruff format joins the
dict comprehension in test_install.py onto one line, and the CI format
check would report the drift.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/python/roles/dev-python/files/test_install.py

@@ -31,9 +31,7 @@ def _call(
         The completed bash process.
     """
     env = {
-        key: value
-        for key, value in os.environ.items()
-        if key != "DEV_PYTHON_REQUIRES"
+        key: value for key, value in os.environ.items() if key != "DEV_PYTHON_REQUIRES"
     }
     if requires is not None:
         env["DEV_PYTHON_REQUIRES"] = requires