CI: fix mamba version and some test file paths

[misialq]

This PR:

• fixes mamba version used by the setup_miniconda to 1.5.10 to prevent CI failures cause by mamba 2.0.0
• updates paths to some test files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (b56f64b) to head (a88b857).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
- Coverage   98.73%   97.72%   -1.02%     
==========================================
  Files          78       64      -14     
  Lines        4671     4615      -56     
  Branches        0      386     +386     
==========================================
- Hits         4612     4510     -102     
+ Misses         59       57       -2     
- Partials        0       48      +48     

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[VinzentRisch]

Everything looks good.
But the codecov report fails it says: Report creating failed: {"message":"Token required because branch is protected"}
I could only find this:
codecov/codecov-action#1580

It says to create a new PR for a workaround but i guess its not that important for this one PR

[VinzentRisch]

Ah I just saw you have two CI checks for coverage and the other one works.
So i guess the other one can be ignored?

[misialq]

Hey @VinzentRisch, yeah, I think it's fine if only one of them works - something seems to be off, though, as the coverage for the project could not have changed that much - there were no code changes in this PR. I think I'd just merge this and address the rest in another PR, if necessary - if that's fine with you.