docs(infraex): bump versions and fix links

[Langleu]

Description

related to https://github.com/camunda/team-infrastructure-experience/issues/343

The PR bumps versions referenced in InfraEx related docs for 8.4/8.5/next.

The helm charts are already referencing the latest releases, which should be available in the next day.

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, and I've assigned @camunda/tech-writers as a reviewer.

[leiicamundi]

Thanks for this update, just a comment regarding the links of the module doc, otherwise, LGTM

[conceptualshark]

👍 Thanks for this maintenance!

[Langleu]

Thank you, I'm on FTO till Monday but would probably merge it then.
The referenced Helm charts are not yet published (PRs exist) so would assume on Monday we can merge it then.

[akeller]

Thank you, I'm on FTO till Monday but would probably merge it then. The referenced Helm charts are not yet published (PRs exist) so would assume on Monday we can merge it then.

@Langleu are you ready to merge?