ci: bump GitHub Actions to Node.js 24-compatible versions

- actions/checkout v4 → v6
- docker/login-action v3 → v4
- docker/setup-qemu-action v3 → v4
- docker/setup-buildx-action v3 → v4
- docker/build-push-action v6 → v7

Clears the Node 20 deprecation annotation (forced removal 2026-09-16).

Author: loning

.github/workflows/build.yaml

@@ -15,7 +15,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get add-on version
         id: version
@@ -24,20 +24,20 @@ jobs:
           echo "version=${version}" >> "$GITHUB_OUTPUT"
 
       - name: Login to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: nyxid-node
           push: true
@@ -58,7 +58,7 @@ jobs:
       packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Get admin add-on version
         id: version
@@ -67,20 +67,20 @@ jobs:
           echo "version=${version}" >> "$GITHUB_OUTPUT"
 
       - name: Login to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Build and push admin
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: nyxid-node-admin
           push: true

.github/workflows/watch-nyxid.yaml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Read latest upstream NyxID release
         id: upstream