Log Message:
py-google-auth: update to 2.26.1.

2.26.1 (2024-01-03)

Bug Fixes

    Ensure that refresh worker is pickle-able. (#1447) (421c184)

2.26.0 (2023-12-20)

Features

    Add optional non blocking refresh for sync auth code (a6dc2c3)
    Add optional non blocking refresh for sync auth code (#1368) (a6dc2c3)

Bug Fixes

    External account user cred universe domain support (#1437) (75068f9)
    Guard delete statements. Add default fallback for _use_non_blocking_refresh. \ 
(#1445) (776d634)