Bump mamba-org/setup-micromamba (#267)

Bumps the github-actions group with 1 update in the / directory: [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba).


Updates `mamba-org/setup-micromamba` from 2 to 3
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v2...v3)

---
updated-dependencies:
- dependency-name: mamba-org/setup-micromamba
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -28,7 +28,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Setup micromamba
-      uses: mamba-org/setup-micromamba@v2
+      uses: mamba-org/setup-micromamba@v3
       with:
         micromamba-version: latest
         environment-file: environment.yaml