chore(deps): update dependency sigstore/cosign to v3.0.4

.gitea/workflows/artifacthub-metadata.yaml

@@ -11,9 +11,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6.0.2
+    - uses: sigstore/cosign-installer@v4.0.0
+      with:
+        cosign-release: "v3.0.4" # renovate: datasource=github-tags depName=sigstore/cosign
     - uses: docker/login-action@v3.7.0
       with:
-        registry: ${{ github.server_url }}
+        registry: git.cryptic.systems
         username: ${{ github.repository_owner }}
         password: ${{ secrets.GIT_CRYPTIC_SYSTEMS_PACKAGE_REGISTRY_TOKEN }}
     - uses: docker/login-action@v3.7.0