Move Docker images to bullseye

Author: Photonios

.circleci/config.yml

@@ -10,7 +10,7 @@ executors:
         default: "16.0"
       debiandist:
         type: string
-        default: "buster"
+        default: "bullseye"
     docker:
       - image: python:<< parameters.pyversion >>-<< parameters.debiandist >>
       - image: postgres:<< parameters.pgversion >>