Update actions/checkout action to v4

.forgejo/workflows/build-release-integration.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: self-hosted
     if: github.repository_owner != 'forgejo-integration' && github.repository_owner != 'forgejo-release'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - id: forgejo
         uses: https://code.forgejo.org/actions/setup-forgejo@v1

.forgejo/workflows/build-release.yml

@@ -20,7 +20,7 @@ jobs:
     # root is used for testing, allow it
     if: secrets.ROLE == 'forgejo-integration' || github.repository_owner == 'root'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Increase the verbosity when there are no secrets
         id: verbose

.forgejo/workflows/publish-release.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: self-hosted
     if: secrets.DOER != '' && secrets.FORGEJO != '' && secrets.TO_OWNER != '' && secrets.FROM_OWNER != '' && secrets.TOKEN != ''
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: copy & sign
         uses: https://code.forgejo.org/forgejo/forgejo-build-publish/publish@v1