Use ruby:3.1.4-bullseye

[Nishnha]

Fixes #7438

The official Docker Ruby image tags used to default to Debian Bullseye, but now that there's a new release of Debian, the Docker image points to the new release.

This breaks things when we try to build or run Core:

 > [stage-0 32/33] RUN gem install bundler -v 2.4.13 --no-document &&  rm -rf /var/lib/gems/*/cache/* &&  bundle config set --global build.psych --with-libyaml-source-dir=/home/dependabot/src/libyaml/yaml-0.2.5 &&  bundle config set --local path 'vendor' &&  bundle config set --local frozen 'true' &&  bundle config set --local without 'development' &&  bundle install &&  rm -rf ~/.bundle/cache:
#0 0.188 /usr/local/bin/ruby: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /usr/local/bin/ruby)
#0 0.188 /usr/local/bin/ruby: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.35' not found (required by /usr/local/lib/libruby.so.3.1)
#0 0.188 /usr/local/bin/ruby: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /usr/local/lib/libruby.so.3.1)
#0 0.188 /usr/local/bin/ruby: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /usr/local/lib/libruby.so.3.1)
#0 0.188 /usr/local/bin/ruby: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /usr/local/lib/libruby.so.3.1)

This PR points our Ruby tag to the older Debian Bullseye image that we expect.

[bdragon]

Thanks for fixing this 🙏

[Nishnha]

Some of the smoke tests are failing but those are due to reasons outside of this PR.

[jakecoffman]

Nice catch!

Maybe in the future we can keep it simple and base the whole image off of the official Ruby one to avoid this.