Migrate billing from Paddle to Lemon Squeezy

tests/Feature/SuperAdminAuditLogMutationTest.php

@@ -54,7 +54,7 @@ class SuperAdminAuditLogMutationTest extends TestCase
         $this->bootSuperAdminPanel($user);
 
         $this->mock(GiftVoucherService::class, function ($mock) use ($voucher): void {
-            $mock->shouldReceive('issueFromPaddle')
+            $mock->shouldReceive('issueFromLemonSqueezy')
                 ->once()
                 ->andReturn($voucher);
         });