v38: Update changelog to have correct authors

[siddharthkp]

• Because we needed to Park released v38 changesets #6997 to fix canary releases, bringing them back gave credit for everyone's work to 1 person 🙃
• Updated Releases @primer/react@38.0.0
• Syncing changelog.md with release notes, have checked for duplicates

[changeset-bot]

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Latest commit: 8c65317

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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 corrects the author attribution in the v38.0.0 changelog. Due to a canary release fix that required cherry-picking commits, all changes were incorrectly attributed to a single author. The changelog has been updated to reflect the correct authors for each contribution, syncing with the release notes and removing duplicates.

[francinelucca]

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