Fix GitHub actions

[anawas]

Due to changes to the conda-incubator/setup-miniconda workflow running the actions test and build-docks failed. This PR fixes the issue by updating our actions to conda-incubator/setup-miniconda@v3.

Summary

Action	Updated?	Tested?	Comment
Tests	yes	yes
Build Docs	yes	yes
Test User Package	yes	no	I didn't dare to test
Build Docker Image	no	no	Doesn't use setup-miniconda
Conda Build	no	no	Doesn't use setup-miniconda
Dev Workflow	no	no	Doesn't use setup-miniconda
pages-build-deployment	no	yes	Successful run after 'Build Docs'

[Lukas113]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.19%. Comparing base (1da8116) to head (fd7beae).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #638   +/-   ##
=======================================
  Coverage   71.19%   71.19%           
=======================================
  Files          55       55           
  Lines        5946     5946           
=======================================
  Hits         4233     4233           
  Misses       1713     1713           

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