remove prettier-plugin-packagejson
it was removed from the readme in eslint-plugin-package-json v0.91.1:
https://github.com/michaelfaith/eslint-plugin-package-json/compare/v0.91.0...v0.91.1#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L189-L193