Update dependency fluxcd/flux2 to v2.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
fluxcd/flux2		minor	v2.2.3 -> v2.3.0
fluxcd/flux2	Kustomization	minor	v2.2.3 -> v2.3.0

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Release Notes

fluxcd/flux2 (fluxcd/flux2)

### [`v2.3.0`](https://togithub.com/fluxcd/flux2/compare/v2.2.3...v2.3.0) [Compare Source](https://togithub.com/fluxcd/flux2/compare/v2.2.3...v2.3.0)

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