chore(package): update serverless-offline to version 6.1.7

Closes #101

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "prettier": "^1.18.2",
     "serverless": "^1.51.0",
     "serverless-dotenv-plugin": "^2.1.1",
-    "serverless-offline": "^5.10.1",
+    "serverless-offline": "^6.1.7",
     "serverless-plugin-warmup": "^4.7.0-rc.1",
     "serverless-prune-plugin": "^1.4.1",
     "serverless-webpack": "^5.3.1",