feat: upgrade to USWDS 3.8.1

[werdnanoslen]

Summary

These are the features released by USWDS in 3.8.0 and 3.8.1:

• Added styles for indeterminate checkboxes and radios
• Added the ability to customize which headings will be pulled into the in-page navigation link list
  • Also changed class name and selection criteria for bolded heading
• Added a sticky header variant to the table component
• Updated sidenav example in documentation per new theme setting
• Make tooltip content hoverable
• Make tooltip dismissible with escape key

Related Issues or PRs

Merged with, and closed, #2962

How To Test

Confirm things work the same as release/PR notes in https://github.com/uswds/uswds/releases/tag/v3.8.0 and https://github.com/uswds/uswds/releases/tag/v3.8.1

Screenshots (optional)

[jpandersen87]

There are major differences in how the components are expected to render after updating to 3.8.0 according to the happo check on dependabot: https://happo.io/a/371/p/453/compare/3fa28c8307424f927466a25545b13fe7e21c6a51/4864fc74278db819f28e2d3fc3da0d724b174aad

[werdnanoslen]

There are major differences in how the components are expected to render after updating to 3.8.0 according to the happo check on dependabot: https://happo.io/a/371/p/453/compare/3fa28c8307424f927466a25545b13fe7e21c6a51/4864fc74278db819f28e2d3fc3da0d724b174aad

Yep, this PR will integrate those changes. I wouldn't merge that dependabot upgrade until we have these all sorted, which is why I included it in this PR. FYI @crwallace