Release Docs Phase 2

[github-actions[bot]]

Acceptance Criteria (Required on creation)

Before the new Platform version is released, the documentation needs to be updated. See Phase 2 in the Release guide. This includes: Phase 2 (days before Release day)

• [x] Stage new version of the docs
• [x] Adjust docs with the new version
• [x] Stage Enterprise Download Page (*, QA)
• [x] Trigger Update of camunda.com
• [x] Company-wide Release Notification

Hints

Links

Breakdown

### Pull Requests / Updates
- [x] https://github.com/camunda/camunda-docs-static/commit/edbb7004c1f6c9fc8753e2d1184591d112d6e94f

[tmetzke]

Update the External Task Client compatibility matrix for 7.20, compatible with version 3.0.x and 7.20.x

[tmetzke]

I will take care of the following next week:

• [ ] Trigger Update of camunda.com
• [ ] Company-wide Release Notification

[tmetzke]

~Waits for https://github.com/camunda/camunda-bpm-platform/issues/3336 to be merged~ Merged ✅

[tmetzke]

Stage new version of the docs

• ✅ Changes are applied according to release guide.
• ✅~New docs-manual job for 7.20 doesn't exist yet, waiting for https://github.com/camunda/camunda-bpm-platform/issues/3339~ New /7.20 has been staged