Merge pull request #301 from Becksteinlab/pin-micromamba

pin micromamba <2

Author: orbeckst

.github/workflows/ci.yaml

@@ -81,6 +81,9 @@ jobs:
     - name: micromamba package and testing environment installation (Python ${{ matrix.python-version }}, GROMACS ${{ matrix.gromacs-version }})
       uses: mamba-org/setup-micromamba@v1
       with:
+        # https://github.com/mamba-org/setup-micromamba/issues/225
+        # https://github.com/Becksteinlab/GromacsWrapper/issues/298
+        micromamba-version: 1.5.10-0      
         environment-file: ci/conda-envs/test_env.yaml
         condarc: |
            channels: