[auto-bump][chart] dex-2.9.14

[d2iq-dispatch]

What type of PR is this?

chore

What this PR does/ why we need it:

Bump dex-controller to v0.6.15 which includes an updated base image (https://github.com/mesosphere/dex-controller/pull/69)

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Checklist

• If a chart is changed, the chart version is correctly incremented.
• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[d2iq-mergebot]

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@mesosphere-mergebot backport