Remove conda workaround

Author: danielhollas

.github/workflows/test-install.yml

@@ -137,9 +137,6 @@ jobs:
         conda install -n base conda-libmamba-solver
         conda config --set solver libmamba
 
-    # Temporary workaround: https://github.com/mamba-org/mamba/issues/488
-    - run: rm /usr/share/miniconda/pkgs/cache/*.json
-
     - name: Test installation
       id: test_installation
       continue-on-error: ${{ matrix.optional }}