feat: support Keycloak v25

[Ben-Sheppard]

Which problem does the PR fix?

Closes #2229

What's in this PR?

With 8.6-alpha5 we will support Keycloak v24 and v25, this PR updates the bitnami chart and Keycloak version for the alpha charts to match that expectation.

Checklist

Please make sure to follow our Contributing Guide.

Before opening the PR:

• In the repo's root dir, run make go.update-golden-only.
• There is no other open pull request for the same update/change.
• Tests for charts are added (if needed).
• In-repo documentation are updated (if needed).

After opening the PR:

• Did you sign our CLA (Contributor License Agreement)? It will show once you open the PR.
• Did all checks/tests pass in the PR?

[aabouzaid]

I will leave this to @drodriguez-305 since the Keycloak upgrade is part of one of his tasks.

[drodriguez-305]

Looks GTM

[leiicamundi]

Hello there!

We’re facing a bug in Keycloak 25 that is preventing us from releasing the image at the moment. The error is being tracked in https://github.com/camunda/team-infrastructure-experience/issues/352. I'll keep you informed once it's resolved.

[Ben-Sheppard]

Hello there!

We’re facing a bug in Keycloak 25 that is preventing us from releasing the image at the moment. The error is being tracked in camunda/team-infrastructure-experience#352. I'll keep you informed once it's resolved.

Thank you for the update!