With each release it makes sense to also update Ruby to the latest patch level to ensure it includes the latest (security) bug fixes. This not only applies to ruby itself but also to the **docker container** which will only include the latest security bug fixes when using the latest ruby patch level as its base image.

The following files will have to have their references to the Ruby version updated to the latest patch level (e.g. changing 2.7.2 to 2.7.3 everywhere):

* [x] .ruby-version
* [x] Gemfile (`ruby '~>` )
* [x] Gemfile.lock (`RUBY VERSION`)
* [x] docs/development/development-environment-osx/README.md
* [x] docs/development/development-environment-ubuntu/README.md
* [x] docs/development/development-environment-docker/README.md
* [x] docs/installation-and-operations/installation/manual/README.md
* Begin of the insertion[x] ~~bumpEnd of the insertion Begin of the deletion [ ] bumpEnd of the deletion rubies in travis-ci-jobs repository (e.g. translations Begin of the insertionbranch)~~End of the insertion Begin of the deletion branch)End of the deletion