fix(expo): use optional chaining for TurboModuleRegistry on web

Replace .web.ts approach with optional chaining in the original spec
file. This avoids TypeScript build issues from moduleSuffixes while
still preventing the crash when TurboModuleRegistry is undefined on web.

Author: chriscanin

packages/expo/src/specs/NativeClerkModule.ts

@@ -11,4 +11,4 @@ export interface Spec extends TurboModule {
   signOut(): Promise<void>;
 }
 
-export default TurboModuleRegistry.get<Spec>('ClerkExpo');
+export default TurboModuleRegistry?.get<Spec>('ClerkExpo') ?? null;