Bump mamba-org/setup-micromamba from 1 to 2 (#400)

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/benchmarks.yml

@@ -22,7 +22,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: flox-bench
           create-args: >-

.github/workflows/ci-additional.yaml

@@ -53,7 +53,7 @@ jobs:
           echo "TODAY=$(date  +'%Y-%m-%d')" >> $GITHUB_ENV
 
       - name: Setup micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ${{env.CONDA_ENV_FILE}}
           environment-name: flox-tests
@@ -106,7 +106,7 @@ jobs:
         run: |
           echo "TODAY=$(date +'%Y-%m-%d')" >> $GITHUB_ENV
       - name: Setup micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ${{env.CONDA_ENV_FILE}}
           environment-name: flox-tests

.github/workflows/ci.yaml

@@ -48,7 +48,7 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/${{ matrix.env }}.yml
           environment-name: flox-tests
@@ -105,7 +105,7 @@ jobs:
           repository: "pydata/xarray"
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/environment.yml
           environment-name: xarray-tests

.github/workflows/upstream-dev-ci.yaml

@@ -43,7 +43,7 @@ jobs:
         run: |
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Set up conda environment
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: flox-tests
           init-shell: bash