USWDS-Site - Time Picker: Add combo box to time picker dependencies

[IHIutch]

Summary

Adds usa-combo-box to time picker dependencies

Related issue

uswds/uswds#6560

Related PR

uswds/uswds#6634

Testing and review

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• Create a changelog entry for any user-facing changes. Learn more about creating changelogs in _data/changelogs/_CHANGELOG-README.md.
• Confirm that this code follows the 18F Front End Coding Style Guide and Accessibility Guide.
• Run git pull origin [base branch] to pull in the most recent updates from your base and check for merge conflicts. (Often, the base branch is main).
• Run npm run prettier:scss to format any Sass updates.
• Run npm test and confirm that all tests pass.
• Run your code through HTML_CodeSniffer and make sure it’s error free.

[msbtterswrth]

@IHIutch you've got some failing tests here too, i think both of these (#6634) are related and need to go together, if so should we combine them into one PR?

[IHIutch]

Hm, the failing jobs don't seem related to my changes. One looks like a Snyk config issue and it seems like the pa11y issue is related to timing out scanning the page. Might be a flaky test.. The icon page is enormous, so it might be taking too long to scan

This PR and uswds/uswds#6634 are in different repos, so they can't be the same PR

[msbtterswrth]

Ope I sure missed that this one is for the docs site. When Anne gets back next week we can poke them about the flaky tests.