fix(migration): remove unique constraint from 'message' column

Remove the unique constraint from the 'message' column in the contact submissions table migration file.

database/migrations/2024_02_24_162055_create_contact_submissions_table.php

@@ -14,7 +14,7 @@ return new class () extends Migration {
             $table->string('discord')->nullable();
             $table->enum('category', ['question', 'advertising', 'bug_report', 'feedback', 'other']);
             $table->string('subject');
-            $table->text('message')->unique();
+            $table->text('message');
             $table->timestamps();
         });
     }