Integration folder `ckeditor5*` peerDeps not updated by release script

[f1ames]

As mentioned in the issue title. The peerDeps should be updated too in integrations folder package.json, to be aligned with ckeditor5* package version from samples directories.

[Dumluregn]

Stylesheets versions in exports configs are also static: https://github.com/ckeditor/ckeditor5-collaboration-samples/blob/1b5d6009419f5a43655693bcba080c6c840a3b47/real-time-collaboration-for-angular/src/app/app.component.ts#L310-L329 (probably in other demos as well).