TST: Update contour test limits

This update the contour test limits due to changed contouring with
closed paths in Matplotlib 3.5.

Additionally updates the Continuous Integration package to make
sure we get proj>=8 and add color to the output.

.github/workflows/ci-testing.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Latest packages
         if: steps.minimum-packages.conclusion == 'skipped'
         run: |
-          echo "PACKAGES=cython fiona matplotlib-base numpy pyproj pykdtree scipy shapely" >> $GITHUB_ENV
+          echo "PACKAGES=cython fiona matplotlib-base numpy pyproj 'proj>=8' pykdtree scipy shapely" >> $GITHUB_ENV
 
       - name: Coverage packages
         id: coverage
@@ -71,6 +71,7 @@ jobs:
           python tools/cartopy_feature_download.py gshhs physical --dry-run
           CARTOPY_GIT_DIR=$PWD
           PYPROJ_GLOBAL_CONTEXT=ON pytest -ra -n 4 --doctest-modules \
+              --color=yes \
               --mpl --mpl-generate-summary=html \
               --mpl-results-path="cartopy_test_output-${{ matrix.os }}-${{ matrix.python-version }}" \
               --pyargs cartopy ${EXTRA_TEST_ARGS}

lib/cartopy/tests/mpl/test_mpl_integration.py

@@ -18,7 +18,7 @@
 
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='global_contour_wrap.png',
-                               style='mpl20')
+                               style='mpl20', tolerance=2.25)
 def test_global_contour_wrap_new_transform():
     ax = plt.axes(projection=ccrs.PlateCarree())
     ax.coastlines()
@@ -30,7 +30,7 @@ def test_global_contour_wrap_new_transform():
 
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='global_contour_wrap.png',
-                               style='mpl20')
+                               style='mpl20', tolerance=2.25)
 def test_global_contour_wrap_no_transform():
     ax = plt.axes(projection=ccrs.PlateCarree())
     ax.coastlines()