chore: use plugins instead of require to load rubocop extensions

In `Rubocop 1.72` was introduced a new API for Rubocop extensions.

See the migration guide here:
https://docs.rubocop.org/rubocop/plugin_migration_guide.html

This removes the following `rubocop` suggestion that is being raised
each time we execute `rubocop:`

```
rubocop-performance extension supports plugin, specify `plugins: rubocop-performance` instead of `require: rubocop-performance` in /mi_carrera/.rubocop.yml.
For more information, see https://docs.rubocop.org/rubocop/plugin_migration_guide.html.

rubocop-rails extension supports plugin, specify `plugins: rubocop-rails` instead of `require: rubocop-rails` in /mi_carrera/.rubocop.yml.
For more information, see https://docs.rubocop.org/rubocop/plugin_migration_guide.html.
```

Author: nicolastemciuc

.rubocop.yml

@@ -1,4 +1,4 @@
-require:
+plugins:
   - rubocop-performance
   - rubocop-rails