cdk8s-cdktf-resolver: Support cdktf ^0.20

[BrentSouza]

Description of the feature or enhancement:

Is there any particular reason this project is fixed on cdktf 0.19? There are some nice enhancements for cdktf 0.20 that we currently can't use when using cdk8s + cdktf in the same project.

Use Case:

Projects where someone wants to use cdktf + cdk8s in the same library.

Proposed Solution:

Update deps.

• [x] :wave: I may be able to implement this feature request
• [x] :warning: This feature might incur a breaking change

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This is a :rocket: Feature Request

[iliapolo]

See my comments on https://github.com/cdk8s-team/cdk8s-cdktf-resolver/pull/445