chore(deps): update dependency fluxcd/flux2 to v0.31.3

This MR contains the following updates:

Package	Update	Change
fluxcd/flux2	patch	v0.31.2 -> v0.31.3

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Release Notes

fluxcd/flux2

v0.31.3

Compare Source

Highlights

Flux v0.31.3 is a patch release that comes with fixes. Users are encouraged to upgrade for the best experience.

Fixes

• Fix for Helm OCI authentication where the credentials were cached instead of being reloaded at each reconciliation
• Fix for health checking Kubernetes Jobs when impersonating a service account

Components changelog

• source-controller v0.25.9
• kustomize-controller v0.26.2

CLI Changelog

• MR #​2881 - @​fluxcdbot - Update toolkit components
• MR #​2877 - @​sympatheticmoose - Add the --branch arg to the basic auth example

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