warning about unsigned integers

[ftoledo]

Glpi v10.0.6
Debian 10
PHP 7.4

[2023-06-16 09:24:32] glpiphplog.WARNING:   *** PHP User Warning (512): Usage of signed integers in primary or foreign keys is discouraged, please use unsigned integers instead in `glpi_plugin_example_examples`.`plugin_example_dropdowns_id`. in //html/src/DBmysql.php at line 2041
  Backtrace :
  src/DBmysql.php:2041                               trigger_error()
  src/DBmysql.php:361                                DBmysql->checkForDeprecatedTableOptions()
  plugins/example/hook.php:493                       DBmysql->query()
  src/Plugin.php:840                                 plugin_example_install()
  front/plugin.form.php:51                           Plugin->install()