Incorrect versions in .env for tag 8.6-alpha4

[schattenk]

See https://github.com/camunda/camunda-platform/blob/8.6-alpha4/.env

The version numbers are incorrect. Expected: 8.6-alpha4, Actual: 8.5.3, 8.5.2

I was wondering why the new features didn't work. That was the explanation.

[jessesimpson36]

We have an internal task that will fix this problem https://github.com/camunda/distribution/issues/288 and we will close this issue when the other issue is closed.

[Arpit529Srivastava]

@schattenk @jessesimpson36 i can work on this issue please assign it to me and add it under the label hacktoberfest

[jessesimpson36]

I don't think this is a good task to work on for hacktoberfest. main has correct versions inside the .env file. And tags cannot be changed inside of a PR.

If you have code recommendations for how we can change our .github/workflows so that a release does not go through unless .env is updated, I would be open for that sort of change. but .env already automatically updates as long as there is not a bug in our renovate config.