upgrade go-cty to v1.13.3

[kmoe]

Fixes #33464 a little closer to the root.
hashicorp/hcl#616 fixes the effect of this in HCL templates (there is no HCL release as yet).

Changelog for cty 1.13.3:

• msgpack: As a compromise to avoid unbounded memory usage for a situation that some callers won't take advantage of anyway, the MessagePack decoder has a maximum length limit on encoded unknown value refinements. For consistency, the encoder will now truncate string prefix refinements if necessary to avoid making the encoded refinements too long. (#167)
  This is consistent with the documented conventions for serializing refinements -- that we can potentially lose detail through serialization -- but in this case we are still able to preserve shorter string prefixes, whereas other serializations tend to just discard refinement information altogether.

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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