Bump github.com/zclconf/go-cty from 1.8.0 to 1.8.1

[dependabot]

Bumps github.com/zclconf/go-cty from 1.8.0 to 1.8.1.

Changelog

Sourced from github.com/zclconf/go-cty's changelog.

1.8.1 (March 16, 2021)

• convert: Fix for panics and some general misbehavior when converting null values to type constraints containing objects with optional attributes. (#88)
• convert: Type unification of a mixture of list and tuple types and for a mixture of map and object types will now do the same recursive unification that we previously did for unification of just list types and just map types respectively, to avoid producing a very different and confusing result in situations where callers try to construct collections from a mixture of nested collections and nested structural types. (#89)
• convert: Conversion will no longer panic if we can't find a suitable single element type to use when converting to a collection type with a dynamically-selected element type. (#91)
• function: The ReturnTypeForValues and Call methods on Function will now protect functions from having to deal with nested marked values for arguments that don't specifically declare AllowMarks: true, as a concession for the fact that many functions were written prior to the introduction of marks as a concept. (#92)

Commits

• 377475b v1.8.1
• 1cfcc07 Update CHANGELOG.md
• f2a1b41 function: don't pass marked values to a Type callback that isn't prepared to ...
• d1aeddc convert: Don't modify the captured element type in a collection conversion
• 34f2ef6 convert: Use path-specific errors for collection unification errors
• 304e801 Update CHANGELOG.md
• 6736481 convert: Don't panic when collection element type unification fails
• 080b168 Update CHANGELOG.md
• 90fd0d5 convert: unify mixtures similar of structural and collection types
• 30f6dd6 Update CHANGELOG.md
• Additional commits viewable in compare view

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