[win-bootstrap] Specify date for Git for Windows unbundling

Bug: b/360206460
Change-Id: I6b666ab76d36a268c7de8de7fe11fe49380c6a46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6171041
Reviewed-by: Allen Li <ayatane@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Anne Redulla <aredulla@google.com>

bootstrap/bootstrap.py

@@ -296,9 +296,13 @@ def search_win_git_directory():
 
     # Log deprecation warning.
     logging.warning(
-        'depot_tools will soon stop bundling Git for Windows.\n'
+        'depot_tools will stop bundling Git for Windows on 2025-01-27.\n'
         'To prepare for this change, please install Git directly. See\n'
         'https://chromium.googlesource.com/chromium/src/+/main/docs/windows_build_instructions.md#Install-git\n'
+        '\n'
+        'Having issues and not ready for depot_tools to stop bundling\n'
+        'Git for Windows? File a bug at:\n'
+        'https://issues.chromium.org/issues/new?component=1456702&template=2045785\n'
     )
     return None