added annotations

Author: daniel-sanche

.github/workflows/unittest.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python: ['3.7', '3.8']
     steps:
     - name: Checkout
       uses: actions/checkout@v4

google/auth/_default.py

@@ -16,6 +16,7 @@
 
 Implements application default credentials and project ID detection.
 """
+from __future__ import annotations
 
 from typing import Sequence
 import io