use johakoch's go-cty and hcl forks (as an example)

[johakoch]

I created my own (synchronized) forks of go-cty and hcl, added the changes that we need (json for go-cty and optional labels for hcl) in separate branches.
Then did a go get https://github.com/johakoch/go-cty@configure-html-escaping and go get https://github.com/johakoch/hcl@optional-label and used the versions in the replaces in go.mod

This PR is not to be merged, just use it as an example.

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Reviewer checklist

• Read PR description: a summary about the changes is required
• Changelog updated
• Documentation: docs/{Reference, Cli, ...}, Docker and cli help/usage
• Pulled branch, manually tested
• Verified requirements are met
• Reviewed the code
• Reviewed the related tests