Bump macOS CI codegen machine

[johanandren]

Before oct2 or it will break:

Update the resource class key in your configuration file from medium to macos.x86.medium.gen2.

[pvlugter]

And then not long until that's deprecated as well:

We are deprecating support for all Intel-based macOS resources.
The medium and large resource classes are being deprecated on October 2, 2023.
The macos.x86.medium.gen2 resource class is being deprecated on January 31, 2024.

And then only the Apple silicon machines supported.

[pvlugter]

Bumped in #512. With the x86 macos machines being completely deprecated in January, we'll need to figure out if we'll just build for ARM then, or rework the code generation. It probably shouldn't be JVM based with a native image. Originally it was a shared code base across SDKs, but could make more sense if was JavaScript/TypeScript based. Or if we wanted to have a common code generation tool across SDKs, then using something that's better for building across platforms.

[ennru]

Refs

• Codegen failing on windows #442