Drop repository password length constraint (#3672)

The repository password column is used for GitHub app tokens. GitHub
[recently
announced](https://github.blog/changelog/2026-04-24-notice-about-upcoming-new-format-for-github-app-installation-tokens/)
a switch to a JWT approach, which will result in much longer tokens.
This drops our length constraint on the password column to accommodate
these longer tokens.

Author: williamjallen

database/migrations/2026_04_27_125711_drop_repository_password_length_limit.php

@@ -0,0 +1,15 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        DB::statement('ALTER TABLE repositories ALTER COLUMN password TYPE text');
+    }
+
+    public function down(): void
+    {
+    }
+};