Update Terraform flux to v1.2.1

This MR contains the following updates:

Package	Type	Update	Change
flux (source)	required_provider	patch	1.2.0 -> 1.2.1

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Release Notes

fluxcd/terraform-provider-flux (flux)

v1.2.1

Compare Source

Release date: 2023-12-15

This release includes flux2 v2.2.1.

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