Update push-to-ghcr.yml: ubuntu-latest

Author: macbre

.github/workflows/push-to-ghcr.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   docker_publish:
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4