upgrade ruby from 3.0.4 to 3.0.6
Changelogs:
- https://www.ruby-lang.org/en/news/2022/11/24/ruby-3-0-5-released/
- https://www.ruby-lang.org/en/news/2023/03/30/ruby-3-0-6-released/
=> No changes which should impact us
Edited by Michael Prilop
Changelogs:
=> No changes which should impact us