Update dependency hashicorp/terraform-provider-hcp to v0.70.0

[tflibsonnet-ci]

(original: tf-libsonnet/libgenerator#207)

This PR contains the following updates:

Package	Update	Change
hashicorp/terraform-provider-hcp	minor	0.68.0 -> 0.69.0

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Release Notes

hashicorp/terraform-provider-hcp (hashicorp/terraform-provider-hcp)

v0.69.0

Compare Source

IMPROVEMENTS:

• Add proxy_endpoint field to enable toggling the proxy option on HCP Vault clusters, along with corresponding read-only vault_proxy_endpoint_url field. [GH-577]
• Adjusted wording in the documentation and error messages for data.hcp_packer_image. [GH-571]

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