use the latest ubuntu vresion

Author: romainVanhee

.github/workflows/ghcr.yaml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   build-docker-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4