build: switch objective sharpie version

[ric-oliv]

Summary

Replace usage of the old objectivesharpie Homebrew cask with the currently maintained Sharpie.Bind.Tool.

Rationale

The homebrew version is an outdated x86_64 Mono application that needs Rosetta, and it only emits usable bindings alongside a separate Xamarin.iOS installation which also needs Rosetta.
The dotnet tool runs natively on Apple silicon and carries its own .NET binding profile, so neither is required.

Rosetta support will be dropped on macOS 28, so this change already addresses this future breakage.

Notes

Regenerating the bindings with the newer Sharpie, besides changing the ApiDefinitions.cs file name (plural -> singular), changes the generated binding for the NSUrlSessionDelegate (generated as INSUrlSessionDelegate instead).

-    NSUrlSessionDelegate UrlSessionDelegate { get; set; }
+    INSUrlSessionDelegate UrlSessionDelegate { get; set; }

This is not a breaking change, as this is not part of our public API:

1. The changed type is internal: The generated SentryObjCOptions is marked [Internal] by patch-cocoa-bindings.cs, so it compiles to an internal type in Sentry.Bindings.Cocoa and never appears in any public contract.
2. The public API is untouched: SentryOptions.Native.UrlSessionDelegate is still public NSUrlSessionDelegate? - that file isn't in this diff.
3. The one crossing point still compiles as before: SentrySdk.cs assigns the public NSUrlSessionDelegate? into the binding's INSUrlSessionDelegate property; that's an implicit reference conversion, since Foundation.NSUrlSessionDelegate implements Foundation.INSUrlSessionDelegate.

Verified with Microsoft.DotNet.ApiCompat.Tool by building Sentry.dll and Sentry.Bindings.Cocoa.dll before and after the change: no breaking changes on either assembly, including --strict-mode (which also flags additions). Reading the property straight out of both assemblies' metadata gives the identical public signature Sentry.SentryOptions+NativeOptions.UrlSessionDelegate : Foundation.NSUrlSessionDelegate.

Incidentally the interface is the more faithful mapping: the Cocoa header declares @property (nonatomic, weak, nullable) id<NSURLSessionDelegate> urlSessionDelegate;, and an id conforming to a protocol maps to the I-prefixed interface rather than the concrete class.

#skip-changelog

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.75%. Comparing base (c5af37d) to head (4c872ca).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5583      +/-   ##
==========================================
- Coverage   74.76%   74.75%   -0.01%     
==========================================
  Files         515      515              
  Lines       18963    18963              
  Branches     3694     3694              
==========================================
- Hits        14177    14176       -1     
- Misses       3908     3909       +1     
  Partials      878      878              

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