Move @types/aws-lambda to dependencies.

It's not enough to include it only in `devDependencies` because without
it TypeScript users are getting type errors.

Author: marshall-lee

packages/serverless/package.json

@@ -20,6 +20,7 @@
     "@sentry/node": "5.27.3",
     "@sentry/types": "5.27.3",
     "@sentry/utils": "5.27.3",
+    "@types/aws-lambda": "^8.10.62",
     "@types/express": "^4.17.2",
     "tslib": "^1.9.3"
   },
@@ -29,7 +30,6 @@
     "@google-cloud/functions-framework": "^1.7.1",
     "@google-cloud/pubsub": "^2.5.0",
     "@sentry-internal/eslint-config-sdk": "5.27.3",
-    "@types/aws-lambda": "^8.10.62",
     "@types/node": "^14.6.4",
     "aws-sdk": "^2.765.0",
     "eslint": "7.6.0",