ci: update actions/checkout to v5 (uses Node 24)

.forgejo/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: https://github.com/actions/checkout@v4
+        uses: https://github.com/actions/checkout@v5
 
       - name: Set up Go
         uses: https://github.com/actions/setup-go@v5

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Go
         uses: actions/setup-go@v5