Bump mamba-org/provision-with-micromamba from 12 to 13 (#364)

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@34071ca7df4983ccd272ed0d3625818b27b70dcc
+        uses: mamba-org/provision-with-micromamba@a319a818023c3a5a448a60bd72e0c633408fbccc
         with:
           environment-file: ci/upstream-dev-env.yml
           environment-name: cf_xarray_test