chore(deps): update Cocoa SDK to v8.15.1 (#2812)

* chore: update modules/sentry-cocoa to 8.15.1
* Update ApiDefinitions.cs

---------

Co-authored-by: GitHub <[email protected]>
Co-authored-by: James Crosswell <[email protected]>

Author: 3 people

CHANGELOG.md

@@ -4,6 +4,9 @@
 
 ### Dependencies
 
+- Bump Cocoa SDK from v8.15.0 to v8.15.1 ([#2812](https://github.com/getsentry/sentry-dotnet/pull/2812))
+  - [changelog](https://github.com/getsentry/sentry-cocoa/blob/main/CHANGELOG.md#8151)
+  - [diff](https://github.com/getsentry/sentry-cocoa/compare/8.15.0...8.15.1)
 - Bump CLI from v2.21.2 to v2.21.3 ([#2811](https://github.com/getsentry/sentry-dotnet/pull/2811))
   - [changelog](https://github.com/getsentry/sentry-cli/blob/master/CHANGELOG.md#2213)
   - [diff](https://github.com/getsentry/sentry-cli/compare/2.21.2...2.21.3)

modules/sentry-cocoa

@@ -2177,6 +2177,10 @@ interface SentryTraceContext : SentrySerializable
     [Export ("initWithTracer:scope:options:")]
     NativeHandle Constructor (SentryTracer tracer, [NullAllowed] SentryScope scope, SentryOptions options);
 
+    // -(instancetype _Nonnull)initWithTraceId:(SentryId * _Nonnull)traceId options:(SentryOptions * _Nonnull)options userSegment:(NSString * _Nullable)userSegment;
+    [Export ("initWithTraceId:options:userSegment:")]
+    NativeHandle Constructor (SentryId traceId, SentryOptions options, [NullAllowed] string userSegment);
+
     // -(SentryBaggage * _Nonnull)toBaggage;
     [Export ("toBaggage")]
     SentryBaggage ToBaggage();