CI: move from macos-latest to macos-13

.github/workflows/run_tests.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false # show all errors for each platform (vs. cancel jobs on error)
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
 
     steps:
 #      - name: Install Linux Deps
@@ -27,12 +27,6 @@ jobs:
 #          sudo apt-get update
 #          sudo apt install libasound2-dev libcurl4-openssl-dev libx11-dev libxinerama-dev libxext-dev libfreetype6-dev libwebkit2gtk-4.0-dev libglu1-mesa-dev libsamplerate-dev
 
-      - name: Install Xcode
-        if: runner.os == 'MacOS'
-        uses: maxim-lobanov/setup-xcode@v1
-        with:
-          xcode-version: '14.3.1'
-
       - name: Get latest CMake
         uses: lukka/get-cmake@latest