Enable all pyupgrade checks in ruff

This will help to keep us from using deprecated Python features going
forward.

Signed-off-by: Tristan Partin <tristan@neon.tech>

test_runner/cloud_regress/test_cloud_regress.py

@@ -2,6 +2,8 @@
 Run the regression tests on the cloud instance of Neon
 """
 
+from __future__ import annotations
+
 from pathlib import Path
 from typing import Any