Do not silently pull in dependencies from PyPI in CI

[saraedum]

since we want (binary) dependencies to always come from conda-forge instead to avoid incompatibilities.

Dependencies

• [x] https://github.com/conda-forge/staged-recipes/pull/21366
• [x] https://github.com/conda-forge/staged-recipes/pull/21367

[saraedum]

Unfortunately, we cannot set --no-deps in the environment.yml file, see https://github.com/conda/conda/issues/6805.

[codecov[bot]]

Codecov Report

Merging #252 (be44578) into master (d989943) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #252   +/-   ##
=======================================
  Coverage   92.20%   92.20%           
=======================================
  Files         105      105           
  Lines        2117     2117           
=======================================
  Hits         1952     1952           
  Misses        165      165           

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