fix: Simplify Mac OS dependency install and clear warning

Installing pkg-config led to the following warning for each macOS pipeline:
pkgconf 2.3.0_1 is already installed and up-to-date. To reinstall 2.3.0_1, run: brew reinstall pkgconf
Additionally, we have support for any OpenSSL version, so don't force v1.1.

.github/workflows/main.yml

@@ -88,8 +88,7 @@ jobs:
       run: |
         # We need to install GNU utils as the test-suite scripts expect it.
         # Without them we may get slightly different behavior in tests and hard-to-track failures
-        brew install pkg-config coreutils diffutils
-        echo "PKG_CONFIG_PATH=/usr/local/opt/[email protected]/lib/pkgconfig/" >> $GITHUB_ENV
+        brew install coreutils diffutils
 
     - name: '[Linux] Install dependencies'
       if: runner.os == 'Linux'