[CI] Finish Python Version TODOs

There were a couple TODOs in .ci related to Python typing changes after
v3.10. Now that Windows is python version matched to Linux at Python
3.12, we do not need to keep using the old syntax.

.ci/generate_test_report_lib.py

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 """Library to parse JUnit XML files and return a markdown report."""
 
-from typing import TypedDict, Optional
+from typing import TypedDict
 import platform
 
 from junitparser import JUnitXml, Failure
@@ -11,12 +11,10 @@ from junitparser import JUnitXml, Failure
 
 # This data structure should match the definition in llvm-zorg in
 # premerge/advisor/advisor_lib.py
-# TODO(boomanaiden154): Drop the Optional here and switch to str | None when
-# we require Python 3.10.
 class FailureExplanation(TypedDict):
     name: str
     explained: bool
-    reason: Optional[str]
+    reason: str | None
 
 
 SEE_BUILD_FILE_STR = "Download the build's log file to see the details."

.ci/premerge_advisor_explain.py

@@ -8,10 +8,6 @@ import platform
 import sys
 import json
 
-# TODO(boomanaiden154): Remove the optional call once we can require Python
-# 3.10.
-from typing import Optional
-
 import requests
 import github
 import github.PullRequest
@@ -24,7 +20,7 @@ PREMERGE_ADVISOR_URL = (
 COMMENT_TAG = "<!--PREMERGE ADVISOR COMMENT: {platform}-->"
 
 
-def get_comment_id(platform: str, pr: github.PullRequest.PullRequest) -> Optional[int]:
+def get_comment_id(platform: str, pr: github.PullRequest.PullRequest) -> int | None:
     platform_comment_tag = COMMENT_TAG.format(platform=platform)
     for comment in pr.as_issue().get_comments():
         if platform_comment_tag in comment.body: