ruff: enable TC — flake8-type-checking (#11368)

## Problem

`TYPE_CHECKING` is used inconsistently across Python tests.

## Summary of changes
- Update `ruff`: 0.7.0 -> 0.11.2
- Enable TC (flake8-type-checking):
https://docs.astral.sh/ruff/rules/#flake8-type-checking-tc
- (auto)fix all new issues

test_runner/cloud_regress/test_cloud_regress.py

@@ -4,11 +4,15 @@ Run the regression tests on the cloud instance of Neon
 
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 import pytest
-from fixtures.neon_fixtures import RemotePostgres
-from fixtures.pg_version import PgVersion
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from fixtures.neon_fixtures import RemotePostgres
+    from fixtures.pg_version import PgVersion
 
 
 @pytest.mark.timeout(7200)