Update module github.com/hashicorp/hcl to v2

[plural-bot]

This PR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/hcl	require	major	v1.0.0 -> v2.14.1

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[davidspek]

Note before merging:

Initial release of HCL 2, which is a new implementating combining the HCL 1
language with the HIL expression language to produce a single language
supporting both nested configuration structures and arbitrary expressions.

HCL 2 has an entirely new Go library API and so is not a drop-in upgrade
relative to HCL 1. It's possible to import both versions of HCL into a single
program using Go's semantic import versioning mechanism:

[plural-bot]

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