Bump actions/checkout from 4 to 5

Author: moonglum

.github/workflows/tests.yml

@@ -5,7 +5,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v6
         with:
           node-version: '22.x'