Backport PR matplotlib#29163: ci: Remove outdated pkg-config package on macOS

Author: QuLogic

Diff for: .github/workflows/tests.yml

@@ -202,6 +202,8 @@ jobs:
               brew unlink ${python_package}
               brew link --overwrite ${python_package}
             done
+            # Workaround for https://github.com/actions/runner-images/issues/10984
+            brew uninstall --ignore-dependencies --force [email protected]
             brew install ccache ghostscript gobject-introspection gtk4 ninja
             brew install --cask font-noto-sans-cjk inkscape
             ;;

Diff for: azure-pipelines.yml

@@ -131,6 +131,8 @@ stages:
                   brew unlink ${python_package}
                   brew link --overwrite ${python_package}
                 done
+                # Workaround for https://github.com/actions/runner-images/issues/10984
+                brew uninstall --ignore-dependencies --force [email protected]
                 brew install --cask xquartz
                 brew install ccache ffmpeg imagemagick mplayer ninja pkg-config
                 brew install --cask font-noto-sans-cjk-sc