fix: issue with snakefmt, issue with mamba version in CI

[fgypas]

Description

Fix issue with snakefmt (remove consecutive comment lines) and remove exact mamba version from CI.

Fixes #109 #110

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation updated

Checklist:

• My code changes follow the style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• I have updated the project's documentation

[fgypas]

There are some new comments in the issues. Please let me know if we need to make further adjustments.

[uniqueg]

Seems like snakefmt 0.8.0 is run against the workflow in the CI and it is not complaining. So the code changes seem to be effective.

Issues with Python 3.7.4 vs 3.10 (#108) can be addressed in another PR.