Bump mamba-org/setup-micromamba from 1.8.1 to 1.9.0 (#268)

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@4225001...f8b8a1e)

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

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

.github/workflows/pytest-with-coverage.yaml

@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Conda environment with Micromamba
-        uses: mamba-org/setup-micromamba@422500192359a097648154e8db4e39bdb6c6eed7
+        uses: mamba-org/setup-micromamba@f8b8a1e23a26f60a44c853292711bacfd3eac822
         with:
            environment-file: envs/environment-test.yaml
            environment-name: salishsea-nowcast-test