Bump mamba-org/provision-with-micromamba from 13 to 14 (#371)

Bumps [mamba-org/provision-with-micromamba](https://github.com/mamba-org/provision-with-micromamba) from 13 to 14.
- [Release notes](https://github.com/mamba-org/provision-with-micromamba/releases)
- [Commits](mamba-org/provision-with-micromamba@a319a81...f347426)

---
updated-dependencies:
- dependency-name: mamba-org/provision-with-micromamba
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

.github/workflows/upstream-dev-ci.yaml

@@ -56,7 +56,7 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
       - name: Set up conda environment
-        uses: mamba-org/provision-with-micromamba@a319a818023c3a5a448a60bd72e0c633408fbccc
+        uses: mamba-org/provision-with-micromamba@f347426e5745fe3dfc13ec5baf20496990d0281f
         with:
           environment-file: ci/upstream-dev-env.yml
           environment-name: cf_xarray_test