Update Terraform sops to v0.7.2

This MR contains the following updates:

Package	Type	Update	Change
sops (source)	required_provider	patch	0.7.1 -> 0.7.2

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Release Notes

carlpett/terraform-provider-sops

v0.7.2

Compare Source

Bug fixes

• Fix conversion of null to <nil> string (#​95, thanks @​chroju!)

Docs

• Document that environment variables required for sops key managers must be set (#​93, thanks @​fardarter!)

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