Downgrade runners to macOS 13

With macOS 14+ the runner images are ARM64 instead of x86_64 and cause
incompatabilities

Author: psyGamer

.github/workflows/build-libs.yml

@@ -45,7 +45,7 @@ jobs:
             cmake_flags:
 
           - name: macOS x64
-            os: macos-latest
+            os: macos-13
             platform: macos
             cmake_flags: --verbose --parallel
 
@@ -383,7 +383,7 @@ jobs:
             container: quay.io/pypa/manylinux_2_28_x86_64 # See https://kobzol.github.io/rust/ci/2021/05/07/building-rust-binaries-in-ci-that-work-with-older-glibc.html
 
           - name: macOS x64
-            os: macos-latest
+            os: macos-13
             toolchain: stable-x86_64-apple-darwin
             target: x86_64-apple-darwin
             ui: gui