relax performance package months to 12 (#439)

Author: pileks

programs/v07_launchpad/src/instructions/initialize_launch.rs

@@ -176,7 +176,7 @@ impl InitializeLaunch<'_> {
 
         require_gte!(
             args.months_until_insiders_can_unlock,
-            18,
+            12,
             LaunchpadError::InvalidPerformancePackageMinUnlockTime
         );