[MTT-12140] Fix: upgrading packages and changing editor version to 6.1

[Elfi0Kuhndorf]

Description

Upgrading Boss Rooms used editor version to 6.1 and upgrading all packages meanwhile.

Issue Number(s)

https://jira.unity3d.com/browse/MTT-12140

Contribution checklist

• Tests have been added for boss room and/or utilities pack
• Release notes have been added to the project changelog file and/or package changelog file
• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• JIRA ticket ID is in the PR title or at least one commit message
• Include the ticket ID number within the body message of the PR to create a hyperlink
• An Index entry has been added in readme.md if applicable