[ci] Drop macOS pkgconf workaround. (#11847)

.github/workflows/main.yml

@@ -501,8 +501,6 @@ jobs:
         run: |
           set -ex
           brew update
-          brew uninstall --force pkg-config
-          brew install pkgconf --overwrite
           brew bundle --file=tests/Brewfile --no-upgrade
           cpanm IPC::System::Simple
           cpanm String::ShellQuote

extra/github-actions/build-mac.yml

@@ -7,8 +7,6 @@
   run: |
     set -ex
     brew update
-    brew uninstall --force pkg-config
-    brew install pkgconf --overwrite
     brew bundle --file=tests/Brewfile --no-upgrade
     cpanm IPC::System::Simple
     cpanm String::ShellQuote