CI: Unlink deprecated brew pkg-config

macOS GitHub Action Runners come with pkg-config installed, but this
package is deprecated in brew. Replace it with pkgconf.

This can be reverted when Action Runners are no longer imaged with
pkg-config.

.github/workflows/publish.yml

@@ -45,7 +45,14 @@ jobs:
 
       - name: Install HDF5 for macOS arm64
         if: ${{ matrix.os_arch[1] == 'macosx_arm64' }}
-        run: brew install hdf5
+        run: |
+          # pkg-config formula is deprecated but it's still installed
+          # in GitHub Actions runner now. We can remove this once
+          # pkg-config formula is removed from GitHub Actions runner.
+          brew unlink [email protected]
+          brew install pkgconf
+          echo "PKG_CONFIG=$(brew --prefix pkgconf)/bin/pkgconf" >> $GITHUB_ENV
+          brew install hdf5
 
       - name: Install cibuildwheel
         run: python -m pip install -U pip wheel cibuildwheel twine

.github/workflows/test.yml

@@ -38,7 +38,12 @@ jobs:
       - name: Fix macos HDF5 library for pytables install (works for python >= 3.10)
         if: ${{ matrix.os == 'macos-latest' }}
         run: |
-          brew update
+          # pkg-config formula is deprecated but it's still installed
+          # in GitHub Actions runner now. We can remove this once
+          # pkg-config formula is removed from GitHub Actions runner.
+          brew unlink [email protected]
+          brew install pkgconf
+          echo "PKG_CONFIG=$(brew --prefix pkgconf)/bin/pkgconf" >> $GITHUB_ENV
           brew install hdf5
 
       - name: Setup xtgeo