fix: upgrade jest version (#354)

jest version bumped to 29.

Author: blimmer

.projen/deps.json

@@ -36,5 +36,8 @@ const project = new CdklabsConstructLibrary({
   gitignore: [
     '*.rest', '.vscode', '**/.DS_Store',
   ],
+  jestOptions: {
+    jestVersion: '^29',
+  },
 });
-project.synth();
+project.synth();