Add Patch level version to Get Started Guide

[berndruecker]

In this guide: https://docs.camunda.io/docs/next/guides/getting-started-java-spring/ (https://github.com/camunda/camunda-docs/edit/main/docs/guides/getting-started-java-spring.md) we need to enter the right patch level so that users can easily copy paste without searching for a version number (which they might not know how).

Of course that means it needs to be updated when we release a patch version.

@akeller These are the small details I find important for a rock star developer experience

[berndruecker]

Even when I know how to search for versions - I can still get confused (do I use the alpha? What's a rc? ..?). No complex decisions - but it carries me away from what I wanted to do: Run a Camunda app as quickly as possible

[berndruecker]

I had the same problem also on other pages - e.g. https://docs.camunda.io/docs/next/apis-tools/testing/getting-started/
I think we should find a way to have the right version numbers everywhere - always up-to-date. Maybe there is some Bot that can do that - otherwise a grep statement should find the right places to adjust on new releases at least.

And I would generally prefer to see 8.5.0 there and probably not the latest patch-level instead of not seeing any version number.
But of course I would prefer to always see the latest patch level up-to-date (8.5.6) :-)

[akeller]

Of course that means it needs to be updated when we release a patch version.

@berndruecker We (DevEx) don't have great visibility into patch releases, just alphas and minors, so while I agree this should be updated, we would need to bake this update into the patch release process. If adding .0 would be sufficient, this would be a quick win.

[akeller]

@mesellings, based on your comment on this PR, you may want to chime in on this thread.