chore: fix release workflow (corymhall#146)

Fixes #

Author: corymhall

.projen/tasks.json

@@ -297,7 +297,7 @@ workflow?.on({
 
 projenProject.packageTask.reset();
 projenProject.packageTask.exec(
-  'cp node_modules/@aws-cdk/aws-service-spec/db.json.gz ./ && ncc build --external fsevents --source-map --license licenses.txt',
+  'rm -rf dist && cp node_modules/@aws-cdk/aws-service-spec/db.json.gz ./ && ncc build --external fsevents --source-map --license licenses.txt',
 );
 workflow?.addJobs({ enableAutoMerge: autoMergeJob });
 project.synth();