fix(helm): update chart cloudnative-pg to 0.18.2

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
cloudnative-pg (source)	patch	0.18.1 -> 0.18.2

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Release Notes

cloudnative-pg/charts (cloudnative-pg)

### [`v0.18.2`](https://togithub.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.18.1...cloudnative-pg-v0.18.2) [Compare Source](https://togithub.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.18.1...cloudnative-pg-v0.18.2)

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