Port generated lib files (#19772)

Author: mhegazy

src/lib/dom.generated.d.ts

@@ -15135,7 +15135,7 @@ type MouseWheelEvent = WheelEvent;
 type ScrollRestoration = "auto" | "manual";
 type FormDataEntryValue = string | File;
 type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = string[][] | { [key: string]: string };
+type HeadersInit = Headers | string[][] | { [key: string]: string };
 type AppendMode = "segments" | "sequence";
 type AudioContextState = "suspended" | "running" | "closed";
 type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";

src/lib/webworker.generated.d.ts

@@ -1890,7 +1890,7 @@ type USVString = string;
 type IDBValidKey = number | string | Date | IDBArrayKey;
 type BufferSource = ArrayBuffer | ArrayBufferView;
 type FormDataEntryValue = string | File;
-type HeadersInit = string[][] | { [key: string]: string };
+type HeadersInit = Headers | string[][] | { [key: string]: string };
 type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
 type IDBRequestReadyState = "pending" | "done";
 type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";