[vendor] upgrade go-cty

[pselle]

Upgrade go-cty to get jsonencode fix, closes #23062

$ go get -u github.com/zclconf/go-cty
$ go mod vendor
$ go mod tidy

[codecov]

Codecov Report

Merging #25078 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
backend/remote/backend_common.go	54.57% <0.00%> (-0.68%)	⬇️
terraform/evaluate.go	53.15% <0.00%> (-0.46%)	⬇️
states/statefile/version4.go	56.16% <0.00%> (-0.29%)	⬇️
dag/marshal.go	53.40% <0.00%> (+1.13%)	⬆️

[alisdair]

Rerunning go mod tidy locally removed these 1.4.1 lines for me.

[ghost]

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