Change: Update Vue to v3.2

Vue has been updated to v3.2. More detailed information can be found in the referenced issues and PRs down below.

BREAKING CHANGE for developers: The `vue/composition-api` plugin is not available anymore as the composition-api now comes with Vue.

https://github.com/owncloud/web/issues/7948
https://github.com/owncloud/web/issues/5269
https://github.com/owncloud/web/issues/8283
https://github.com/owncloud/web/issues/8307
https://github.com/owncloud/web/issues/8295
https://github.com/owncloud/web/pull/8128
https://github.com/owncloud/web/pull/7877
https://github.com/owncloud/web/pull/8207
https://github.com/owncloud/web/pull/8201
https://github.com/owncloud/web/pull/8202
https://github.com/owncloud/web/pull/8198
https://github.com/owncloud/web/pull/8213
https://github.com/owncloud/web/pull/8214
https://github.com/owncloud/web/pull/8221
https://github.com/owncloud/web/pull/8256
https://github.com/owncloud/web/pull/8257
https://github.com/owncloud/web/pull/8258
https://github.com/owncloud/web/pull/8282
https://github.com/owncloud/web/pull/8289
https://github.com/owncloud/web/pull/8287
https://github.com/owncloud/web/pull/8285
https://github.com/owncloud/web/pull/8288
https://github.com/owncloud/web/pull/8308
https://github.com/owncloud/web/pull/8311
https://github.com/owncloud/web/pull/8567
