Revert "fix: Update token refresh threshold from 20 seconds to 5 minutes (#1146)" (#1153)
Revert "fix: Update token refresh threshold from 20 seconds to 5 minutes (#1146)" (#1153)

This reverts commit 261a56138fba33ff7d898ab5907a6098125fefef.
googleapis/google-auth-library-python,googleapis/google-auth-library-python