build: remove legacy Apple SDK frameworks (#2885)

Thanks for your work on atuin! I've loved using it over the past year.

According to nixos.org[^1], the `darwin.apple_sdk` frameworks have been stubs for some time, and are now removed. Evaluating `atuin` on darwin on `nixpkgs-unstable` results in the following evaluation error:

```
error: darwin.apple_sdk_11_0 has been
  removed as it was a legacy compatibility stub; see
  <https://nixos.org/manual/nixpkgs/stable/#sec-darwin-legacy-frameworks>
  for migration instructions
```

According to those linked docs, the fix is to remove references to these SDKs, which will not have any other effect since they were stubs anyway.

[^1]: https://nixos.org/manual/nixpkgs/stable/#sec-darwin-legacy-frameworks

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## Checks
- [x] I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the same thing

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