Update build container image.

Author: gizmoguy

.github/workflows/release-debian.yml

@@ -13,7 +13,7 @@ jobs:
     name: "Build debian packages"
     runs-on: ubuntu-latest
     container:
-      image: "ubuntu:bionic"
+      image: "debian:latest"
     steps:
       - name: Install dependencies
         run: |