Merge pull request 'Update node Docker tag to v21' (#9) from renovate/node-21.x into main

Reviewed-on: #9

.forgejo/workflows/deploy.yaml

@@ -7,7 +7,7 @@ jobs:
   build:
     runs-on: docker
     container:
-      image: node:16-bullseye # Required by actions/checkout and actions/upload-artifact
+      image: node:21-bullseye # Required by actions/checkout and actions/upload-artifact
     steps:
       - uses: actions/checkout@v4
       - name: Install dependencies
@@ -23,7 +23,7 @@ jobs:
     needs: [build]
     runs-on: docker
     container:
-      image: node:16-bullseye # Required by actions/download-artifact
+      image: node:21-bullseye # Required by actions/download-artifact
     steps:
       - uses: actions/download-artifact@v3
         with: