Improve compatibility of the ButtonGroup with the Modal component

[connor-baer]

Purpose

With the new container-based responsive styles, the ButtonGroup now uses a vertical layout inside the Modal component on wide viewports. This is not the intended behavior.

Approach and changes

• Reduced the container width at which the ButtonGroup component switches to a horizontal layout to improve compatibility with the Modal component.

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

🦋 Changeset detected

Latest commit: aa75a1d

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

This PR includes changesets to release 1 package

Name	Type
@sumup/circuit-ui	Patch

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Name	Status	Preview	Comments	Updated (UTC)
oss-circuit-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 19, 2023 0:17am

[codecov]

Codecov Report

Merging #2349 (0bfc8fb) into canary (31b7b64) will not change coverage.
The diff coverage is n/a.

❗ Current head 0bfc8fb differs from pull request most recent head aa75a1d. Consider uploading reports for the commit aa75a1d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           canary    #2349   +/-   ##
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  Coverage   96.95%   96.95%           
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  Files         252      252           
  Lines       20277    20277           
  Branches     1263     1263           
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  Hits        19660    19660           
  Misses        604      604           
  Partials       13       13