Update what to upgrade in update_all_components.md

.gitlab/issue_templates/update_all_components.md

 To update all applications, check the following files:
 
-* [ ] Docker base image in `Dockerfile` (`FROM`)
-* [ ] All app versions in `Dockerfile`, especially:
-  * [ ] flux (Make sure the version is the same as in `ansible/group_vars/all/oas.yml`, `flux.version`)
+* CI Container image in `Dockerfile`:
+  * [ ] Base image (`FROM`)
+  * [ ] All app versions in `Dockerfile`, especially:
+    * [ ] flux (Make sure the version is the same as in `ansible/group_vars/all/oas.yml`, `flux.version`)
 * [ ] `requirements.in`
   * [ ] Run `pip install -r requirements-dev.txt && pip-compile`
-* [ ] mitogen version in `ansible/plugins`
+* [ ] Mitogen version in `ansible/plugins`
 
-In `group_vars/all/oas.yml`:
+In `ansible/group_vars/all/oas.yml`:
 
 * [ ] k3s
 * [ ] helm
+* [ ] flux
 * [ ] krew
 * [ ] velero
 
 Installed by flux:
 
 * [ ] Run `find flux2 -name '*release*.yaml'` and paste the resulting list here
-* [ ] make sure to also update our [nextcloud helm chart](https://open.greenhost.net/openappstack/nextcloud)
-* [ ] make sure that our wordpress chart installs the newest version
+* Update our custom helm-charts and their dependencies, make sure they install
+  latest versions
+  * [ ] [nextcloud](https://open.greenhost.net/openappstack/nextcloud)
+  * [ ] [wordpress](https://open.greenhost.net/openappstack/wordpress-helm)
+  * [ ] [single-sign-on](https://open.greenhost.net/openappstack/single-sign-on)