Revert "Build faliure fix 2"

This reverts commit 69bc0adf29.

src/proxy.ts

@@ -82,9 +82,7 @@ function buildCsp(): string {
   ].join("; ");
 }
 
-type AuthenticatedNextRequest = NextRequest & { auth?: unknown };
-
-export async function handleProxyRequest(req: AuthenticatedNextRequest) {
+export async function handleProxyRequest(req: NextRequest) {
   const { pathname } = req.nextUrl;
   const csp = buildCsp();