github/workflows: use checkout v3

Fix:

Node.js 12 actions are deprecated. For more information see:
https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.
Please update the following actions to use Node.js 16: actions/checkout

Signed-off-by: Tim Orling <tim.orling@konsulko.com>

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

@@ -40,7 +40,7 @@ jobs:
       DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       # Build and test the images
       - name: Run build-and-test.sh