Tim Duesterhus b81a7f428b CI: Update to actions/checkout@v5
No functional change, but we should keep this current.

see 5f4ddb54b05ae0355b1f64c22263a6bc381410df
see 5c923f1869881156bf3a25c9659655ae10f7dbd0
2025-08-13 19:15:04 +02:00
..
2025-08-08 15:36:11 +02:00