Bump mamba-org/setup-micromamba from 2.0.2 to 2.0.3

Bumps [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v2.0.2...v2.0.3)

---
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]>

.github/workflows/tests.yml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup Micromamba
-        uses: mamba-org/[email protected].2
+        uses: mamba-org/[email protected].3
         with:
           environment-file: environment.yml
           cache-environment: true