🔧 Load rubocop-factory_bot explicitly

- when loading rubocop-rspec
- See: https://github.com/rubocop/rubocop-rspec/blob/fe954419feb0d51710d69c373aa8ff0d35ad9f4e/CHANGELOG.md?plain=1#L51

rubocop-lts/rspec.yml

@@ -1,6 +1,7 @@
 require:
   # I setup RSpec on every project. Do you?
   - rubocop-rspec
+  - rubocop-factory_bot
 
 inherit_gem:
   rspec-block_is_expected: rubocop.yml