chore(deps): update terraform hcp to v0.68.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hcp (source)	required_provider	minor	0.67.0 -> 0.68.0

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Release Notes

hashicorp/terraform-provider-hcp (hcp)

v0.68.0

Compare Source

BREAKING CHANGES:

• Removed the iteration block from hcp_packer_channel, previously deprecated in v0.63.0 [GH-555]

FEATURES:

• Channel restriction can now be configured with the restricted field of hcp_packer_channel [GH-555]

IMPROVEMENTS:

• Add support for HCP Packer Managed channels to hcp_packer_channel. Also adds a read-only managed attribute. [GH-555]

DEPRECATIONS:

• The hcp_packer_image_iteration data source is now deprecated.
  Use the hcp_packer_image or hcp_packer_iteration data sources instead. [GH-569]

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