fix: vercelUrl must always be https (#46193)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Bug fix

## What is the current behavior?

Only checks the for a valid URL that has hostname of vercel.com.

## What is the new behavior?

Ensures the URL protocol is HTTPS

## Additional context

Vercel will never load over any other protocol than HTTPS

apps/studio/components/interfaces/Integrations/Vercel/VercelIntegration.utils.ts

@@ -1,6 +1,7 @@
 export function isVercelUrl(url: string): boolean {
   try {
-    return new URL(url).hostname === 'vercel.com'
+    const u = new URL(url)
+    return u.protocol === 'https:' && u.hostname === 'vercel.com'
   } catch {
     // If the URL is invalid, return false
     return false