Fix benchmark:all_methods task by excluding Faker::Deprecator module from benchmark target

[amatsuda]

Motivation / Background

I found that the benchmark task rake benchmark:all_methods is not working on current main branch.

So here's a patch that makes the task runnable again.

Additional information

The task has been broken since f586da7 that added a new module named Faker::Deprecator. And this patch just adds it to the ignore module list.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug, refactor something, or add a feature. => Actually, no. But the tasks that used not to work are now working.
• Tests and Rubocop are passing before submitting your proposed changes.

[koic]

Nice!