Migrate CI from provision-with-micromamba to setup-micromamba

https://github.com/mamba-org/provision-with-micromamba#migration-to-setup-micromamba

Author: tsgolden

.github/workflows/push.yml

@@ -31,9 +31,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Setup Micromamba
-      uses: mamba-org/provision-with-micromamba@main
-      with:
-        environment-file: false
+      uses: mamba-org/setup-micromamba@v1
 
     - name: Python ${{ matrix.python-version }}
       shell: bash -l {0}