fix(InfiniteScroll): improve accessibility

[matthprost]

Summary

Type

• Enhancement

Summarise concisely:

What is expected?

Improve InfiniteScroll accessibility

[changeset-bot]

🦋 Changeset detected

Latest commit: 3c13ecc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@ultraviolet/ui	Patch
@ultraviolet/form	Patch
@ultraviolet/plus	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.36%. Comparing base (ce2eb84) to head (3c13ecc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4909   +/-   ##
=======================================
  Coverage   89.36%   89.36%           
=======================================
  Files         235      235           
  Lines        8231     8231           
  Branches     3770     3770           
=======================================
  Hits         7356     7356           
  Misses        875      875           

Files with missing lines	Coverage Δ
...ackages/ui/src/components/InfiniteScroll/index.tsx	87.23% <ø> (ø)

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