Use do throws(E) for concrete catch typing in JSRemote

Co-authored-by: Shelley <shelley@exe.dev>

Author: kateinoigakukun

Sources/JavaScriptEventLoop/JSRemote.swift

@@ -66,12 +66,10 @@ private final class _JSRemoteContext: @unchecked Sendable {
         continuation: CheckedContinuation<Result<R, E>, Never>
     ) {
         self.invokeBody = {
-            do {
+            do throws(E) {
                 continuation.resume(returning: .success(try body(sourceObject)))
-            } catch let error as E {
-                continuation.resume(returning: .failure(error))
             } catch {
-                preconditionFailure("Unexpected error type: \(error)")
+                continuation.resume(returning: .failure(error))
             }
             return false
         }