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

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/hcl/v2	v2.20.1 -> v2.21.0

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Release Notes

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

### [`v2.21.0`](https://togithub.com/hashicorp/hcl/blob/HEAD/CHANGELOG.md#v2210-June-19-2024) [Compare Source](https://togithub.com/hashicorp/hcl/compare/v2.20.1...v2.21.0) ##### Enhancements - Introduce `ParseTraversalPartial`, which allows traversals that include the splat (`[*]`) index operator. ([#​673](https://togithub.com/hashicorp/hcl/pull/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](https://togithub.com/hashicorp/hcl/pull/679)) ##### Bugs Fixed - Expression evaluation will no longer panic if the splat operator is applied to an unknown value that has cty marks. ([#​678](https://togithub.com/hashicorp/hcl/pull/678))

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