chore(deps): update helm release dex to v0.15.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
dex (source)	helm_release	patch	0.15.2 -> 0.15.3

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Release Notes

dexidp/helm-charts (dex)

### [`v0.15.3`](https://togithub.com/dexidp/helm-charts/releases/tag/dex-0.15.3) [Compare Source](https://togithub.com/dexidp/helm-charts/compare/dex-0.15.2...dex-0.15.3) OpenID Connect (OIDC) identity and OAuth 2.0 provider with pluggable connectors.

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Configuration

📅 Schedule: Branch creation - "before 3am on Monday" in timezone Europe/Berlin, Automerge - "after 1am,before 4am" in timezone Europe/Berlin.

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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