feat: Retry on HTTP 400 / "failedPrecondition"

Extracts out a function to decode the contents.

Author: ttung

googleapiclient/http.py

@@ -34,6 +34,7 @@
 import time
 import urllib
 import uuid
+from typing import Optional
 
 import httplib2
 
@@ -77,7 +78,7 @@
 _LEGACY_BATCH_URI = "https://www.googleapis.com/batch"
 
 
-def _decode_reason_from_content(content) -> str | None:
+def _decode_reason_from_content(content) -> Optional[str]:
     reason = None
 
     if not content: