ci: OSX now only tests on clang15 (#1345)

.github/workflows/ci.yml

@@ -132,9 +132,7 @@ jobs:
       fail-fast: false # Don't fail everything if one fails. We want to test each OS/Compiler individually
       matrix:
         cfg:
-          - { arch: 'arm64', concurrency: 3, os: macos-latest, cpp: clang++, version: 16, cmake-flags: '', xcode-version: '16.0.0' }
           - { arch: 'arm64', concurrency: 3, os: macos-latest, cpp: clang++, version: 15, cmake-flags: '', xcode-version: '15.3' }
-          - { arch: 'arm64', concurrency: 3, os: macos-latest, cpp: clang++, version: 14, cmake-flags: '', xcode-version: '14.3.1' }
     steps:
       - name: Harden Runner
         uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
@@ -150,7 +148,7 @@ jobs:
           xcode-version: ${{ matrix.cfg.xcode-version }}
 
       - name: Install homebrew packages
-        run: brew install cmake make opus openssl pkg-config
+        run: brew install cmake make opus openssl
 
       - name: Generate CMake
         run: cmake -B build -DDPP_NO_VCPKG=ON -DCMAKE_BUILD_TYPE=Release -DDPP_CORO=ON -DAVX_TYPE=AVX0