Fix step name (Docker Hub -> GitHub Container Registry)

.github/workflows/docker-io.yaml

@@ -28,7 +28,7 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: ghcr.io/misskeyio/misskey
-      - name: Log in to Docker Hub
+      - name: Log in to GitHub Container Registry
         uses: docker/login-action@v2
         with:
           registry: ghcr.io
@@ -37,7 +37,7 @@ jobs:
       - name: Prepare image tags
         run: |
           echo "FORMATTED_BRANCH_NAME=$(echo ${{ github.ref_name }} | sed -e 's/\//-/g' )" >> $GITHUB_ENV
-      - name: Build and Push to Docker Hub
+      - name: Build and Push to GitHub Container Registry
         uses: docker/build-push-action@v4
         with:
           builder: ${{ steps.buildx.outputs.name }}