feat(argo-workflows): Support ephemeral credentials for s3

[bmjhversteeg]

In argoproj/argo-workflows#12467, support for ephemeral S3 credentials was added. These are used when using AWS S3 Grants or AWS IAM Roles. This PR adds support for the sessionTokenSecret field to the argo-workflows helm chart.

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[yu-croco]

📝 sessionTokenSecret is already released in v3.6.2
Ref: https://argo-workflows.readthedocs.io/en/latest/fields/#fields_70

[yu-croco]

Thank you for your contribution. LGTM.

[tico24]

@yu-croco 3.6 docs are here: https://argo-workflows.readthedocs.io/en/release-3.6/fields/ but you're still right :)