Switch a few stragglers to uv and update python to 3.12 (#7296)

Not sure how these got missed when moving other things to `uv`, but this
should clean them up.

The bump to Python 3.12 is so that we can use `@override` with the
simple import from `typing`. This is needed by the newest versions of
`ty` to do type checking. Added the relevant `@override` annotations.

Assisted-by: Antigravity with Gemini

github_tools/pr_comments.py

@@ -1,4 +1,13 @@
-#!/usr/bin/env python3
+#!/usr/bin/env -S uv run --script
+
+# /// script
+# requires-python = ">=3.12"
+# dependencies = [
+#   "gql==2.0.0",
+#   "requests",
+# ]
+# ///
+
 
 """Figure out comments on a GitHub PR."""
 
@@ -14,7 +23,7 @@ import hashlib
 import importlib.util
 import os
 import textwrap
-from typing import Any, Callable, Optional
+from typing import Any, Callable, Optional, override
 
 # Do some extra work to support direct runs.
 try:
@@ -178,6 +187,7 @@ class _PRComment(_Comment):
     def __lt__(self, other: "_PRComment") -> bool:
         return self.timestamp < other.timestamp
 
+    @override
     def format(self, long: bool) -> str:
         return "%s\n%s" % (self.url, super().format(long))