Change i386 test image to bullseye as buster reached EOL (#763)

Author: misl6

.github/workflows/push-x86.yml

@@ -11,7 +11,7 @@ jobs:
            - '3.10'
            - '3.11'
     container:
-      image: i386/python:${{ matrix.python }}-buster
+      image: i386/python:${{ matrix.python }}-bullseye
     steps:
     - name: info
       run: |