ci(release): bump v0.15.8

[iamhyc]

prepare release of v0.15.8

P.S. updated THREE authors contributed to this repo.

[Copilot]

Pull request overview

Prepares the v0.15.8 release for the Overleaf Workshop extension by updating version metadata and documenting the release notes.

Changes:

• Bump extension version to 0.15.8 in package.json and package-lock.json.
• Update CHANGELOG.md with the 0.15.8 release entry.
• Add additional contributors to package.json.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
package.json	Bumps version and updates contributors list for the release.
package-lock.json	Syncs lockfile version metadata to 0.15.8.
CHANGELOG.md	Adds release notes for 0.15.8.

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