Replace the plugin version with the release version when merging the CHANGELOG update

[xterao]

Since it's not possible to update the pluginVersion in gradle.properties before creating the tag during publishRelease, we'll switch from the beta version to the release version following these steps:

1. When pushing the commit that updates the CHANGELOG, include a change that updates the pluginVersion in gradle.properties.
2. By merging the PR that updates the CHANGELOG, merge both the updated release notes and the plugin version into the main branch.
3. During publish Release, create the release tag based on the main branch and publish the release.