chore(deps): update terraform flux to v1.4.0

This MR contains the following updates:

Package	Type	Update	Change
flux (source)	required_provider	minor	1.3.0 -> 1.4.0

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Release Notes

fluxcd/terraform-provider-flux (flux)

v1.4.0

Compare Source

Release date: 2024-09-30

This release includes flux2 v2.4.0.

The client-go auth plugins are now imported, which allows using auth providers like OIDC, GCP, Azure, etc., for connecting to the cluster.

In addition, the Kubernetes dependencies have been updated to v1.31.1 and the provider is now built with Go 1.23.

Improvements:

• Build with Go 1.23 #​710
• Import client-go auth plugin to fix oidc auth issue #​702
• Various dependency updates #​691 #​698 #​699 #​701 #​707 #​711 #​715 #​718 #​719

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