Bump mamba-org/setup-micromamba from 1 to 2 (#30)

Bumps [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) from 1 to 2.
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v1...v2)

---
updated-dependencies:
- dependency-name: mamba-org/setup-micromamba
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -356,7 +356,7 @@ jobs:
       with:
         submodules: true
 
-    - uses: mamba-org/setup-micromamba@v1
+    - uses: mamba-org/setup-micromamba@v2
       with:
         environment-file: .github/mamba_env.yaml
         environment-name: win-test