Snakemake version
b88171c

Describe the bug
When running pixi run pytest tests/tests_using_conda.py on an M1 MacBook Pro, the following tests fail:

• test_script, test_issue635: fail due to missing r-base=3.6.1
• test_wrapper, test_wrapper_qsub, test_wrapper_local_git_prefix: fail because conda can't find htslib==1.9
• test_conda_pin_file: fails because ripgrep=12.0 isn't available
  -test_conda_python_3_7_script: fails because python=3.7.12 isn't available
• test_script_pre_py39: fails because python=3.7 isn't available

Minimal example

On Apple silicon, run:

pixi run pytest tests/tests_using_conda.py

Additional context
Is it worth updating these tests to use more recent package versions so that they can be run successfully on macOS-arm64?