build(deps): bump site/_data/plugin-repository

Bumps [site/_data/plugin-repository](https://github.com/OpenTabletDriver/Plugin-Repository) from `9c6825b` to `668715d`.
- [Commits](OpenTabletDriver/Plugin-Repository@9c6825b...668715d)

---
updated-dependencies:
- dependency-name: site/_data/plugin-repository
  dependency-version: 668715d4a67870653f526773809a3fe1a9849ae2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]