Fix crash when evaluating nested sensitive values #1557
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As a limitation of go-cty, marked values cannot be serialized.
https://github.com/zclconf/go-cty/blob/v1.11.1/cty/msgpack/marshal.go#L45-L47
There are
IsMarked/HasMarkandContainMarkedmethods for determining whether a value is marked, but the former cannot determine nested sensitive values such as objects. So returning a nested sensitive value will cause an error like #1457.This PR fixes it to determine with
ContainMarkedwhen serializing the value.