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 is dedicated to preparing the modelbased package for its next CRAN release. The core changes involve updating the package's version number in the DESCRIPTION file and ensuring the NEWS.md file accurately reflects this new version, setting the stage for a smooth distribution.

Highlights

• Version Update: The package version in the DESCRIPTION file has been incremented from "0.13.0.12" to "0.13.1".
• NEWS File Synchronization: The NEWS.md file header has been updated to reflect the new "0.13.1" release version, moving from a development tag.

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[gemini-code-assist]

Code Review

This pull request prepares the package for a new CRAN release, version 0.13.1. The changes involve updating the version number in the DESCRIPTION file and updating the header in NEWS.md to reflect the new version. These changes are correct and consistent with the standard procedure for a package release. The NEWS.md file correctly documents the new features and bug fixes included in this version. The changes look good for release.