add release notes meta data

[as-op]

No description provided.

[oliverguenther]

Hi @as-op , thanks for the correction 👍 Just as a side-note, both these changes are automated by the devkit upon releasing, and they ensure the correct date is set under release-notes/README.md, and in the frontmatter.

For 14.5., it seems I accidentally copied the output without the frontmatter. In future versions, we will create a release notes draft as soon as the release/X.Y is opened - which will contain the correct frontmatter.

[as-op]

@oliverguenther Perfect, I knew there was a script. On the overview page the entry was missing too, so I assumed it was created manually.