Merge pull request #22336 from overleaf/ii-upgrade-my-plan-link

[web] Upgrade plan link fix

GitOrigin-RevId: 943475bfb06d70bfa472459353b4f7def7b17932

services/web/frontend/js/features/group-management/components/add-seats/add-seats.tsx

@@ -307,7 +307,7 @@ function AddSeats() {
                 )}
                 <div className="d-flex align-items-center justify-content-end gap-2">
                   <a
-                    href="user/subscription/group/upgrade-subscription"
+                    href="/user/subscription/group/upgrade-subscription"
                     rel="noreferrer noopener"
                     className="me-auto"
                   >