Bump mamba-org/setup-micromamba from 1.8.0 to 1.8.1 (#8392)

Bumps [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v1.8.0...v1.8.1)

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

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

.github/workflows/dvc-diff.yml

@@ -33,7 +33,7 @@ jobs:
       uses: iterative/[email protected]
 
     - name: Setup Micromamba
-      uses: mamba-org/[email protected].0
+      uses: mamba-org/[email protected].1
       with:
         environment-name: gmt
         condarc: |