Update GitHub Actions to use latest versions of checkout, Buildx, and login actions

Author: EvanDarwin

.github/workflows/dockerimage.yml

@@ -11,18 +11,18 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v2
+      uses: docker/setup-buildx-action@v3
 
     - name: Configure Docker BuildKit
       run: |
         echo "DOCKER_BUILDKIT=1" >> $GITHUB_ENV
         
     - name: Login to Docker Hub
       if: github.event_name != 'pull_request'
-      uses: docker/login-action@v2
+      uses: docker/login-action@v3
       with:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}