Prepare CRAN release

[strengejacke]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @strengejacke, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request prepares the package for a new CRAN release by updating the package's version number and its corresponding changelog entry. This is a standard procedure to mark a new stable version of the software.

Highlights

• Version Update: The package version has been incremented from 0.15.2.5 to 0.15.3 in preparation for a new release.
• Changelog Update: The NEWS.md file has been updated to reflect the new version 0.15.3, replacing the development header.

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[gemini-code-assist]

Code Review

This pull request prepares the package for a CRAN release by updating the version in the DESCRIPTION and NEWS.md files. The changes are appropriate for this purpose. However, I've identified a critical syntax error in the DESCRIPTION file that needs to be addressed to ensure the CRAN submission is successful.