Revert "bump base image for Ruby 3.1.3" (#653)

This reverts commit 0595fc2.

The new image is currently incompatible with the Discourse stable branch.

Author: davidtaylorhq

launcher

@@ -91,7 +91,7 @@ git_rec_version='1.8.0'
 config_file=containers/"$config".yml
 cidbootstrap=cids/"$config"_bootstrap.cid
 local_discourse=local_discourse
-image="discourse/base:2.0.20221221-0050"
+image="discourse/base:2.0.20220818-0047"
 docker_path=`which docker.io 2> /dev/null || which docker`
 git_path=`which git`