ci: install contourpy via conda-forge

Author: consideRatio

continuous_integration/docker/hadoop/_install.sh

@@ -6,7 +6,7 @@ cd /working
 # FIXME: pip should be installed to a modern version in the base image instead
 #        of being upgraded here. It isn't because of
 #        https://github.com/dask/dask-gateway/issues/837.
-pip install "pip==24.*"
+pip install "pip==26.*"
 
 # pykerberos needs to compile c++ code that depends on system libraries, by
 # installing it from conda-forge, we avoid such hassle.

continuous_integration/docker/pbs/_install.sh

@@ -6,7 +6,12 @@ cd /working
 # FIXME: pip should be installed to a modern version in the base image instead
 #        of being upgraded here. It isn't because of
 #        https://github.com/dask/dask-gateway/issues/837.
-pip install "pip==24.*"
+pip install "pip==26.*"
+
+# contourpy needs to compile c++ code that depends on system libraries, by
+# installing it from conda-forge, we avoid such hassle.
+#
+mamba install -c conda-forge contourpy
 
 # This installs everything we need for tests
 pip install -r tests/requirements.txt

continuous_integration/docker/slurm/_install.sh

@@ -6,7 +6,7 @@ cd /working
 # FIXME: pip should be installed to a modern version in the base image instead
 #        of being upgraded here. It isn't because of
 #        https://github.com/dask/dask-gateway/issues/837.
-pip install "pip==24.*"
+pip install "pip==26.*"
 
 # This installs everything we need for tests
 pip install -r tests/requirements.txt