Update Helm release nginx to v18.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
nginx (source)	patch	18.1.8 -> 18.1.9

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Release Notes

bitnami/charts (nginx)

### [`v18.1.9`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/nginx/CHANGELOG.md#1819-2024-08-14) - \[bitnami/nginx] Release 18.1.9 ([#​28886](https://togithub.com/bitnami/charts/pull/28886))

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