Fix circular dependency with @nextcloud/vue-richtext

[julien-nc]

Use @nextcloud/vue-richtext 2.1.0-beta.6 which fixes the circular dependency by including @nextcloud/vue in its rollup package.

This made it impossible to import both @nextcloud/vue and @nextcloud/vue-richtext in the same script and caused rendering issues of @nextcloud/vue-richtext when used in @nextcloud/vue.

This is a temporary fix for things to work until @nextcloud/vue-richtext is merged in here.
refs #3812

[raimund-schluessler]

For one of my apps I now see

ERROR in ./node_modules/@nextcloud/vue-richtext/dist/index.js 16072:15-67
Module not found: Error: Can't resolve '@nextcloud/calendar-js' in '/home/runner/work/inventory/inventory/node_modules/@nextcloud/vue-richtext/dist'
resolve '@nextcloud/calendar-js' in '/home/runner/work/inventory/inventory/node_modules/@nextcloud/vue-richtext/dist'

after trying to update to nextcloud/[email protected]