Bump mamba-org/setup-micromamba from 1 to 2

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]>

.github/workflows/benchmarks.yml

@@ -27,7 +27,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-name: climpred-benchmarks
           cache-environment: true

.github/workflows/climpred_testing.yml

@@ -42,7 +42,7 @@ jobs:
         with:
             fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/minimum-tests.yml
           environment-name: climpred-minimum-tests
@@ -100,7 +100,7 @@ jobs:
         with:
             fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Setup conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/maximum-tests.yml
           environment-name: climpred-maximum-tests
@@ -149,7 +149,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Setup conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/maximum-tests.yml
           environment-name: climpred-maximum-tests
@@ -183,7 +183,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/docs.yml
           environment-name: climpred-docs

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

@@ -52,7 +52,7 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda (micromamba)
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ci/requirements/climpred-dev.yml
           environment-name: climpred-dev