Fix duplicate CLEARML__secure__auth__token_secret in apiserver-asyncdelete-deployment.yaml

[benglewis]

What this PR does / why we need it:
Fixes duplicate environment variable

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Verify the work you plan to merge addresses an existing issue (If not, open a new one) (required)
• Check your branch with helm lint (required)
• Update version in Chart.yaml according semver rules (required)
• Substitute annotations section in Chart.yaml annotating implementations (useful for Artifecthub changelog) (required)
• Update chart README using helm-docs (required)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[benglewis]

@filippo-clearml Is there any chance that this will be merged? It is blocking me upgrading to the latest Helm chart with the latest ClearML :/

[benglewis]

@filippo-clearml @valeriano-manassero I don't mean to be a bugbear, but we are stuck unable to upgrade our ClearML version because of this bug and so I would really like to see this PR merged 🙏

[filippo-clearml]

Hey @benglewis sorry for the delay.
Of course, we're going to merge this soon! Thanks for the contribution :)

[benglewis]

@filippo-clearml I applied the change to Chart.yaml. Hopefully you can merge this :)