Reduce update_all_components.md by steps done by renovate

.gitlab/issue_templates/update_all_components.md

 To update all applications, check the following files:
 
-* CI Container image in `Dockerfile`:
-  * [ ] Base image (`FROM`)
-  * [ ] All app versions in `Dockerfile`, especially:
+* `Dockerfile`:
+  * [ ] All apk app versions
+  * [ ] All non-apk 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`
 
 In `ansible/group_vars/all/oas.yml`:
@@ -18,7 +16,6 @@ In `ansible/group_vars/all/oas.yml`:
 
 Installed by flux:
 
-* [ ] Run `find flux2 -name '*release*.yaml'` and paste the resulting list here
 * Update our custom helm-charts and their dependencies, make sure they install
   latest versions
   * [ ] [nextcloud](https://open.greenhost.net/openappstack/nextcloud)