CI: Check micromamba version

Output the `micromamba` version used in the CI workflow so we can
debug any errors in the CI workflow with the same version locally.

Author: joverlee521

.github/workflows/ci.yaml

@@ -52,6 +52,7 @@ jobs:
         run: |
           curl -fsSL --proto 'https=' https://micro.mamba.pm/install.sh | bash
           echo ~/.local/bin >> "$GITHUB_PATH"
+      - run: micromamba --version
 
       - uses: actions/checkout@v4