Bugfix release for 2022.6 "Cohn"

This bugfix release udpates the following apps to their newest patch
releases:

* Core → 2.10.2
* Alsijil → 2.1.1
* Chronos → 2.4.1
* Untis → 2.3.2
* Stoelindeling → 1.0.1

The notable fixes include:

* Better display of error messages in background tasks, like CSV
  import
* Automatic clean up of expired OAuth tokens for performance reasons
* Permissions for handling seating plans by non-group-teachers
* Improvements for Untis import handling

Feature release

Feature release

Release 2022.6 "Cohn"

Bugfix release

Dev release

Standard distribution release 2021.12 "Bruner"

2021.6rc2 – Release Candidate for AlekSIS 2021.6 "Bruner"

2021.6rc1 – Release Candidate for AlekSIS 2021.6 "Bruner"

2021.6b2 Beta Release for AlekSIS 2021.6 "Bruner"

2021.6b1 Beta Release for AlekSIS 2021.6 "Bruner"

2.0b0 – Beta Release for AlekSIS 2021.06 "Bruner"