fix(core): discovery location loading order (#663)

Author: brendt

src/Tempest/Core/src/Kernel/LoadDiscoveryLocations.php

@@ -25,8 +25,8 @@ public function __invoke(): void
             [
                 ...$this->kernel->discoveryLocations,
                 ...$this->discoverCorePackages(),
-                ...$this->discoverAppNamespaces(),
                 ...$this->discoverVendorPackages(),
+                ...$this->discoverAppNamespaces(),
             ];
     }