Bump mamba-org/setup-micromamba from 1.8.1 to 1.9.0 (#8535)

Bumps [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v1.8.1...v1.9.0)

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

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

.github/workflows/ci-caches.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Install GMT
-        uses: mamba-org/setup-micromamba@v1.8.1
+        uses: mamba-org/setup-micromamba@v1.9.0
         with:
           environment-name: gmt
           condarc: |

.github/workflows/dvc-diff.yml

@@ -33,7 +33,7 @@ jobs:
       uses: iterative/setup-cml@v3
 
     - name: Setup Micromamba
-      uses: mamba-org/setup-micromamba@v1.8.1
+      uses: mamba-org/setup-micromamba@v1.9.0
       with:
         environment-name: gmt
         condarc: |