Mamba install -> micromamba install

Author: martinRenou

.github/workflows/main.yml

@@ -78,7 +78,7 @@ jobs:
 
       - if: matrix.mpl-version != 'latest'
         name: Install matplotlib pinned
-        run: mamba install matplotlib=${{ matrix.mpl-version}}.*
+        run: micromamba install matplotlib=${{ matrix.mpl-version}}.*
 
       - uses: actions/download-artifact@v2
         with: