Bump mamba-org/setup-micromamba from 1 to 2 (#231)

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>

.github/workflows/build_docs.yml

@@ -34,7 +34,7 @@
            fetch-depth: 0 # Fetch all history for all branches and tags.
 
        - name: Setup micromamba
-         uses: mamba-org/setup-micromamba@v1
+         uses: mamba-org/setup-micromamba@v2
          with:
            environment-file: ${{ matrix.environment-file }}
            micromamba-version: 'latest'

.github/workflows/testing.yml

@@ -56,7 +56,7 @@ jobs:
            fetch-depth: 0 # Fetch all history for all branches and tags.
 
       - name: setup micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ${{ matrix.environment-file }}
           micromamba-version: 'latest'