remove unused private method

packages/wallets/phantom/src/adapter.ts

@@ -37,7 +37,6 @@ interface PhantomWallet extends EventEmitter<PhantomWalletEvents> {
     signMessage(message: Uint8Array): Promise<{ signature: Uint8Array }>;
     connect(): Promise<void>;
     disconnect(): Promise<void>;
-    _handleDisconnect(...args: unknown[]): unknown;
 }
 
 interface PhantomWindow extends Window {