feat!: upgrade providers to CDKTF version 0.20.0 (#259)

This PR upgrades CDKTF from version `0.19.0` to version `0.20.0` in the
prebuilt providers managed by this project.

Signed-off-by: team-tf-cdk <github-team-tf-cdk@hashicorp.com>

projenrc.template.js

@@ -7,7 +7,7 @@ const { CdktfProviderProject } = require("@cdktf/provider-project");
 const project = new CdktfProviderProject({
   useCustomGithubRunner: __CUSTOM_RUNNER__,
   terraformProvider: "__PROVIDER__",
-  cdktfVersion: "^0.19.0",
+  cdktfVersion: "^0.20.0",
   constructsVersion: "^10.3.0",
   minNodeVersion: "18.12.0",
   jsiiVersion: "~5.2.0",