chore: remove redundant instruction from lint-staged config

[jamesgeorge007]

Summary
Bump lint-staged dep. Since v10 modified files are automatically added to the git commit index.

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe: bump dependency

Does this PR introduce a breaking change? (check one)

• Yes
• No

Other information:

N/A

• DO NOT include files inside lib directory.

[Koooooo-7]

According to lint-staged documentation they will automatically add to git index since version 10, it's okay to upgrade.

I suggest we'd better to wait and see the latest version for a while.
I prefer to use a steady version now.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

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[trusktr]

I've been using the new lint-staged for a while in my projects. It works very well. The author of that library is very responsive and fixes all issues immediately, and does a very good job with it.

[trusktr]

This doesn't affect end users. I say let's merge it. It works well. I was bothered by the left-over modifications after each commit.

[trusktr]

Thanks @jamesgeorge007 !