chore(deps): pin prettier to 2.6.0 to fix build

Author: Cameron Magee

.projen/deps.json

@@ -17,6 +17,7 @@ const project = new awscdk.AwsCdkConstructLibrary({
   license: 'MIT-0',
   pullRequestTemplateContents: ['# Fixes', ' ', ' ', 'By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.'],
   releaseToNpm: true,
+  devDeps: ['@types/[email protected]'],
 });
 
 project.addPeerDeps('aws-cdk-lib');