fix: Use forgejo patched artifact actions

.forgejo/workflows/release-image.yml

@@ -150,7 +150,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"          
 
       - name: Upload digest
-        uses: actions/upload-artifact@v4
+        uses: forgejo/upload-artifact@v4
         with:
           name: digests-${{ matrix.slug }}
           path: /tmp/digests/*
@@ -163,7 +163,7 @@ jobs:
     needs: [define-variables, build-image]
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v4
+        uses: forgejo/download-artifact@v4
         with:
           path: /tmp/digests
           pattern: digests-*