chore(deps): update helm release dex to 0.18.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
dex (source)	minor	0.17.1 -> 0.18.0

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Release Notes

dexidp/helm-charts (dex)

### [`v0.18.0`](https://togithub.com/dexidp/helm-charts/releases/tag/dex-0.18.0) [Compare Source](https://togithub.com/dexidp/helm-charts/compare/dex-0.17.1...dex-0.18.0) OpenID Connect (OIDC) identity and OAuth 2.0 provider with pluggable connectors.

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Configuration

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