workflows: bump checkout action to v4

Silence the node16 warning

Node.js 16 actions are deprecated. Please update the following actions to
use Node.js 20: actions/checkout@v3. For more information see:
https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Signed-off-by: Tim Orling <[email protected]>

.github/workflows/build-test-deploy.yml

@@ -21,7 +21,7 @@ jobs:
       DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Build the image
       - name: build