address unhappy mamba people

Author: trungleduc

.github/workflows/main.yml

@@ -28,9 +28,8 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Conda environment with Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
-          micromamba-version: '1.5.5-0'
           environment-name: voila
           create-args: >-
             python=${{ matrix.python_version }}
@@ -91,9 +90,8 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Conda environment with Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
-          micromamba-version: '1.5.5-0'
           environment-name: voila
           create-args: >-
             python=${{ matrix.python_version }}