chore!: upgrade to cdktf 0.20.0 (#38)

This PR initiates the upgrade of CDKTF from version `0.19.0` to version
`0.20.0`.
Unfortunately, not everything can be automated, and the following steps
need to be completed manually:
 
- [x] Update `@cdktf/provider-null` to a version compatible with
`cdktf@0.20.0`
[here](https://github.com/cdktf/construct-projen-template/blob/d62067602139725e957e516ef41d94c384af731a/.projenrc.ts#L84).
Look up the version
[here](https://github.com/cdktf/cdktf-provider-null/releases/).
- [x] Run `npx projen`
 
Please checkout this PR, complete the above steps, push the changes to
this branch, and then mark this PR as ready for review to complete the
upgrade. Thanks!

---------

Signed-off-by: team-tf-cdk <github-team-tf-cdk@hashicorp.com>
Co-authored-by: Daniel Schmidt <danielmschmidt92@gmail.com>

.projenrc.ts

@@ -28,6 +28,7 @@ const githubActionPinnedVersions = {
   "peter-evans/create-pull-request": "153407881ec5c347639a548ade7d8ad1d6740e38", // v5.0.2
 };
 
+const constructsVersion = "10.3.0";
 const project = new cdktf.ConstructLibraryCdktf({
   name,
   description: "A projen template for CDKTF constructs authored by HashiCorp",
@@ -75,16 +76,17 @@ const project = new cdktf.ConstructLibraryCdktf({
   //   moduleName: `github.com/cdktf/${shortName}-go`,
   //   packageName: shortName.replace(/-/g, ""),
   // },
-  cdktfVersion: "0.19.0",
+  cdktfVersion: "0.20.0",
+  constructsVersion,
   jsiiVersion: "~5.2.0",
   typescriptVersion: "~5.2.0", // should always be the same major/minor as JSII
   minNodeVersion: "18.12.0",
 });
 
 project.addPeerDeps(
-  "cdktf@>=0.19.0",
-  "@cdktf/provider-null@>=9.0.0",
-  "constructs@^10.0.25"
+  "cdktf@>=0.20.0",
+  "@cdktf/provider-null@>=10.0.0",
+  "constructs@>=" + constructsVersion
 );
 project.addDevDeps(
   "change-case",

README.md

@@ -5,7 +5,7 @@ A projen template for CDKTF constructs authored by HashiCorp (internal use only)
 ## Compatibility
 
 - `node` >= 18.12.0
-- `cdktf` >= 0.19.0
+- `cdktf` >= 0.20.0
 - `constructs` >= 10.0.25
 
 ## How to Use

test/index.spec.ts

@@ -33,7 +33,7 @@ test("synthesizes the null provider", () => {
         "required_providers": {
           "null": {
             "source": "null",
-            "version": "3.2.1"
+            "version": "3.2.2"
           }
         }
       }