Exclude package-lock.json from pretty-format-json pre-commit hook

[jsf9k]

🗣 Description

This pull request excludes package-lock.json from pretty-format-json pre-commit hook.

💭 Motivation and context

We can just let npm format this file however it wants to and avoid having to reformat it when Dependabot makes a pull request to update a dependency.

🧪 Testing

All automated tests pass.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.

[dav3r]

👍