refactor: ensure zone.js can be built with typescript strict flag (#30993)

As part of FW-1265, the `zone.js` package is made compatible
with the TypeScript `--strict` flag. Read more about the strict flag [here](https://www.typescriptlang.org/docs/handbook/compiler-options.html)

PR Close #30993

packages/zone.js/lib/browser/webapis-user-media.ts

@@ -7,7 +7,7 @@
  */
 Zone.__load_patch('getUserMedia', (global: any, Zone: any, api: _ZonePrivate) => {
   function wrapFunctionArgs(func: Function, source?: string): Function {
-    return function() {
+    return function(this: unknown) {
       const args = Array.prototype.slice.call(arguments);
       const wrappedArgs = api.bindArguments(args, source ? source : (func as any).name);
       return func.apply(this, wrappedArgs);