chore: fix npmignore

Author: tmokmss

.npmignore

@@ -15,6 +15,9 @@ const project = new awscdk.AwsCdkConstructLibrary({
     dirs: [],
     ignorePatterns: ['example/**/*', 'test/assets/**/*', 'test/*.snapshot/**/*', '*.d.ts'],
   },
+  npmIgnoreOptions: {
+    ignorePatterns: ['/example/lambda/node_modules'],
+  },
   gitignore: ['*.js', '*.d.ts', '!test/.*.snapshot/**/*', '.tmp'],
   keywords: ['aws', 'cdk', 'lambda', 'aws-cdk'],
   tsconfigDev: {