chore(deps): update dependency fluxcd/flux2 to v0.26.3

This MR contains the following updates:

Package	Update	Change
fluxcd/flux2	patch	v0.26.2 -> v0.26.3

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Release Notes

fluxcd/flux2

v0.26.3

Compare Source

Highlights

Flux v0.26.3 is a patch release that comes with fixes to bootstrap. Users are encouraged to upgrade for the best experience.

In addition, kustomize-controller was update to be on par with Kustomize v4.5.2 release.

Components changelog

• kustomize-controller v0.20.2

CLI changelog

• MR #​2418 - @​stefanprodan - Fix bootstrap: Reset schema cache after applying CRDs
• MR #​2416 - @​fluxcdbot - Update kustomize-controller to v0.20.2
• MR #​2415 - @​stefanprodan - Add GitRepository namespace arg to flux create image update

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