fix(deps): update module github.com/hashicorp/hcl/v2 to v2.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/hcl/v2	v2.19.1 -> v2.21.0

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Release Notes

hashicorp/hcl (github.com/hashicorp/hcl/v2)

v2.21.0

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Enhancements

• Introduce ParseTraversalPartial, which allows traversals that include the splat ([*]) index operator. (#​673)
• ext/dynblock: Now accepts marked values in for_each, and will transfer those marks (as much as technically possible) to values in the generated blocks. (#​679)

Bugs Fixed

• Expression evaluation will no longer panic if the splat operator is applied to an unknown value that has cty marks. (#​678)

v2.20.1

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Bugs Fixed

• Return ExprSyntaxError when an invalid namespaced function is encountered during parsing (#​668)

Internal

• Standardize on only two value dumping/diffing libraries (#​669)

v2.20.0

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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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