Bump mamba-org/setup-micromamba from 1 to 2 (#7)

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

.github/workflows/build-book.yaml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/envs/environment.yaml
 

.github/workflows/tests.yaml

@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ${{ matrix.env }}