CI: try updating matplotlib

.travis.yml

@@ -53,8 +53,10 @@ jobs:
             - export MINICONDA_PATH_WIN=`cygpath --windows $MINICONDA_PATH`
             - export MINICONDA_SUB_PATH=$MINICONDA_PATH/Scripts
             - export MINICONDA_LIB_BIN_PATH=$MINICONDA_PATH/Library/bin
-            - choco install openssl.light
-            - choco install miniconda3 --params="'/JustMe /AddToPath:1 /D:$MINICONDA_PATH_WIN'"
+            # - choco install openssl.light
+            # - choco install miniconda3 --params="'/JustMe /AddToPath:1 /D:$MINICONDA_PATH_WIN'"
+            - wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Windows-x86_64.exe -O miniconda.exe
+            - start /wait "" miniconda.exe /S /InstallationType=JustMe /AddToPath=1 /D=$MINICONDA_PATH_WIN
             - export PATH="$MINICONDA_PATH:$MINICONDA_SUB_PATH:$MINICONDA_LIB_BIN_PATH:$PATH"
             - source $MINICONDA_PATH/etc/profile.d/conda.sh
             - hash -r
@@ -83,13 +85,14 @@ install:
     - travis_retry conda create -n test-env
     - eval "$(conda shell.bash hook)"
     - conda activate test-env
-    - if [ "$TRAVIS_OS_NAME" = "linux" ]; then travis_retry conda install -c conda-forge python=${TRAVIS_PYTHON_VERSION%-dev}; else travis_retry conda install -c conda-forge python=3.11; fi
+    - if [ "$TRAVIS_OS_NAME" = "linux" ]; then travis_retry conda install -c conda-forge python=${TRAVIS_PYTHON_VERSION%-dev}; else travis_retry conda install -c conda-forge python=3.9; fi
     - travis_retry conda install -c conda-forge numpy scipy python-igraph h5netcdf tqdm
     - travis_retry conda update  -c conda-forge --all
 
     # testing dependencies
     - travis_retry conda install -c conda-forge tox flake8 pylint pytest-xdist pytest-cov codecov
     - travis_retry conda install -c conda-forge networkx matplotlib cartopy sphinx
+    - travis_retry conda update  -c conda-forge --all
 
     # debugging info
     - conda info -a