Ubuntu is upgraded to latest (#99)

Author: kcs-koteswaradodda

.github/workflows/apache-proxy.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     environment: Deploy to Docker Hub
     steps:
     - name: Checkout code
@@ -30,4 +30,4 @@ jobs:
     - name: Push Docker image
       run: |
         docker push ${{ env.APACHE_OIDC_REPO }}:github-build-${{ github.run_number }}
-        docker push ${{ env.APACHE_OIDC_REPO }}:latest
+        docker push ${{ env.APACHE_OIDC_REPO }}:latest