Build for MacOS x86 on macos-13 runner

The latest runner for MacOS is running on arm64 architecture. The
cibuildwheel cross compiling for x86 fails, so we build these wheels on
the latest MacOS runner that runs on x86 (macos-13).

.github/workflows/wheels.yaml

@@ -23,7 +23,9 @@ jobs:
             arch: aarch64
           - os: ubuntu-20.04
             arch: i686
-          - os: macos-latest
+          # macos-latest runs on arm64 architecture and cibuildwheel cross
+          # compiling for x86_64 fails
+          - os: macos-13
             arch: x86_64
           - os: macos-latest
             arch: arm64