Update dependency serverless-iam-roles-per-function to v3

Author: renovate-bot

backend/package.json

@@ -40,7 +40,7 @@
         "js-yaml": "3.14.1",
         "prettier": "2.2.1",
         "serverless": "1.83.2",
-        "serverless-iam-roles-per-function": "2.0.2",
+        "serverless-iam-roles-per-function": "3.1.0",
         "serverless-pseudo-parameters": "2.5.0",
         "serverless-webpack": "5.3.5",
         "ts-jest": "26.5.1",