Update issue templates

Author: fideloper

.github/ISSUE_TEMPLATE/laravel-9-updates.md

@@ -0,0 +1,14 @@
+---
+name: Laravel 9 Updates
+about: Inform about Laravel 9 changes
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+NOTE: Laravel has incorporated this package into the core of Laravel as of Laravel 9.
+
+Do not use this package in Laravel 9. Details here: https://github.com/fideloper/TrustedProxy/issues/152
+-->