fix(import): duplicate properties are emitted when they differ only by case (#2721)

Fixes #2341
Fixes #2722

----

This requires merging cdklabs/json2jsii#1560 and pulling in the new version of `json2jsii`.

Author: iliapolo

.projen/deps.json

@@ -46,7 +46,7 @@ const project = new Cdk8sTeamTypeScriptProject({
     'sscaff',
     'yaml',
     'yargs@^15',
-    'json2jsii@0.4.5',
+    'json2jsii@0.5.0',
     'colors',
     'ajv',
     'table',