Backport of Upgrade to hcl v2.7.2 into v0.14

[teamterraform]

Backport

This PR is auto-generated from #27055 to be assessed for backporting due to the inclusion of the label 0.14-backport.

The below text is copied from the body of the original PR.

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Fixes #27041, fixes #26746. Targeting backport to 0.14.0 because #27041 is a crash with sensitive values.

Upstream changelog:

Bugs Fixed

• gohcl: Fix panic when decoding into type containing value slices. (#335)
• hclsyntax: The unusual expression null[*] was previously always returning an unknown value, even though the rules for [*] normally call for it to return an empty tuple when applied to a null. As well as being a surprising result, it was particularly problematic because it violated the rule that a calling application may assume that an expression result will always be known unless the application itself introduces unknown values via the evaluation context. null[*] will now produce an empty tuple. (#416)
• hclsyntax: Fix panic when traversing a list, tuple, or map with cty "marks" (#424)

[codecov]

Codecov Report

Merging #27056 (b5cdf5a) into v0.14 (2b485cd) will increase coverage by 0.46%.
The diff coverage is 67.87%.

Impacted Files	Coverage Δ
backend/remote-state/gcs/backend.go	0.00% <0.00%> (ø)
command/apply.go	42.38% <0.00%> (-0.21%)	⬇️
command/console.go	37.25% <0.00%> (ø)
command/fmt.go	76.38% <0.00%> (ø)
command/get.go	40.00% <0.00%> (-3.25%)	⬇️
command/graph.go	43.75% <0.00%> (ø)
command/import.go	53.53% <0.00%> (ø)
command/init.go	62.72% <0.00%> (ø)
command/output.go	71.85% <0.00%> (ø)
command/plan.go	41.95% <0.00%> (ø)
... and 60 more

[ghost]

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