pin more versions (#31)

Author: mathause

.github/workflows/ci-additional.yaml

@@ -83,7 +83,7 @@ jobs:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
       - name: Create conda environment
-        uses: mamba-org/provision-with-micromamba@main
+        uses: mamba-org/provision-with-micromamba@v14
         with:
           environment-name: min-version-policy
           environment-file: false

.github/workflows/ci.yaml

@@ -33,7 +33,7 @@ jobs:
           echo "CONDA_ENV_FILE=ci/requirements/environment.yml" >> $GITHUB_ENV
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV
       - name: Create conda environment
-        uses: mamba-org/provision-with-micromamba@main
+        uses: mamba-org/provision-with-micromamba@v14
         with:
           cache-downloads: true
           cache-downloads-key: "${{runner.os}}-${{runner.arch}}-py${{matrix.python-version}}-${{hashFiles(env.CONDA_ENV_FILE)}}"

requirements.txt

@@ -3,6 +3,6 @@
 # https://help.github.com/en/github/visualizing-repository-data-with-graphs/listing-the-packages-that-a-repository-depends-on
 
 cartopy >= 0.17
-matplotlib >= 3.2
+matplotlib >= 3.4
 numpy >= 1.17
 setuptools >= 40.4  # for pkg_resources