fix(core): Check fetch support with data URL (#18225)

As Deno requires a valid URL when calling `new Request`, `example.com`
was used but this caused problems.

This PR changes it to a data URL as it does not rely on external
dependencies and is a valid URL in Deno.

Fixes: #18218

Previous PR for that:
#5630

Author: s1gr1d

packages/core/src/utils/supports.ts

@@ -80,7 +80,8 @@ function _isFetchSupported(): boolean {
 
   try {
     new Headers();
-    new Request('http://www.example.com');
+    // Deno requires a valid URL so '' cannot be used as an argument
+    new Request('data:,');
     new Response();
     return true;
   } catch {