Stop using the bullseye version as default for php82

We are moving to bookworm (Debian 12) as new default, while
out-dating the buster one. See, for more information:

#179

Author: stronk7

.github/workflows/test_buildx_and_publish.yml

@@ -71,7 +71,6 @@ jobs:
             latest=false
           tags: |
             type=raw,value={{branch}}
-            type=match,pattern=(\d+.\d+),value={{branch}}
 
       # https://github.com/docker/setup-qemu-action#usage
       - name: Set up QEMU