chore(deps): update dependency hashicorp/hcl to v2.20.0

This MR contains the following updates:

Package	Update	Change
hashicorp/hcl	minor	2.19.1 -> 2.20.0

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Release Notes

hashicorp/hcl (hashicorp/hcl)

v2.20.0

Compare Source

Enhancements

• Support for namespaced functions (#​639)

Bugs Fixed

• ext/dynblock: if iterator is invalid return this error instead of consequential errors (#​656)

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