Bump mamba-org/setup-micromamba from 1.8.0 to 1.8.1 (#22)

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@8767fb7...4225001)

---
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/run-tests.yaml

@@ -51,7 +51,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up Conda env
-        uses: mamba-org/setup-micromamba@8767fb704bd78032e9392f0386bf46950bdd1194
+        uses: mamba-org/setup-micromamba@422500192359a097648154e8db4e39bdb6c6eed7
         with:
           environment-name: myenv
           cache-environment: true