[ci] Fix macos-14 pkgconf issue. (#11833)

.github/workflows/main.yml

@@ -501,6 +501,7 @@ jobs:
         run: |
           set -ex
           brew update
+          brew uninstall --force pkg-config
           brew bundle --file=tests/Brewfile --no-upgrade
           cpanm IPC::System::Simple
           cpanm String::ShellQuote

extra/github-actions/build-mac.yml

@@ -7,6 +7,7 @@
   run: |
     set -ex
     brew update
+    brew uninstall --force pkg-config
     brew bundle --file=tests/Brewfile --no-upgrade
     cpanm IPC::System::Simple
     cpanm String::ShellQuote