Adjust Breadcrumb item focus outline

[langermank]

Closes https://github.com/github/primer/issues/5854

Before:

After:

[changeset-bot]

🦋 Changeset detected

Latest commit: 732600e

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

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Patch
@primer/styled-react	Patch

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[Copilot]

Pull Request Overview

This PR adjusts the focus outline styling for Breadcrumb items to improve visual consistency. The change increases the outline width from 1px to 2px and adds a border-radius to create more rounded corners on the focus indicator.

Key Changes:

• Modified focus outline width from 1px to 2px for better visibility
• Added border-radius to focus state for visual consistency with design system patterns

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react/src/Breadcrumbs/Breadcrumbs.module.css	Updated focus-visible styling with border-radius and increased outline width
.changeset/wise-baboons-sing.md	Added changeset entry documenting the Breadcrumb focus outline adjustment