Upgrade to hcl v2.7.2

[alisdair]

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 #27055 (7256738) into master (111825d) will decrease coverage by 0.01%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
terraform/node_resource_plan.go	95.28% <0.00%> (-1.89%)	⬇️
terraform/eval_diff.go	66.51% <0.00%> (-0.92%)	⬇️
terraform/node_resource_apply_instance.go	75.00% <0.00%> (-0.79%)	⬇️
dag/walk.go	91.54% <0.00%> (-0.71%)	⬇️

[ghost]

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