Fix eventsource DOM shim for TS 5.0 beta

The types that the DOM monkeypatch shims are now the precise literals instead of number.

The new code won't succeed until tomorrow. See microsoft/TypeScript#52328

Author: sandersn

types/eventsource/dom-monkeypatch.d.ts

@@ -39,10 +39,10 @@ interface Event {
    * "submit".
    */
   readonly type: string;
-  readonly AT_TARGET: number;
-  readonly BUBBLING_PHASE: number;
-  readonly CAPTURING_PHASE: number;
-  readonly NONE: number;
+  readonly AT_TARGET: 2;
+  readonly BUBBLING_PHASE: 3;
+  readonly CAPTURING_PHASE: 1;
+  readonly NONE: 0;
   composedPath(): any[];
   initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
   preventDefault(): void;

types/eventsource/index.d.ts

@@ -5,6 +5,7 @@
 //                 Pedro Gámez <https://github.com/snakedrak>
 //                 Akuukis <https://github.com/Akuukis>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// Minimum TypeScript Version: 5.0
 
 // eventsource uses DOM dependencies which are absent in a browserless environment like node.js.
 // to avoid compiler errors this monkey patch is used. See more details in: