chore: Drop support for v1 version of serverless

BREAKING CHANGE:
Serverless Framework v2 or later is required (dropped support for v1)

Author: medikoo

package.json

@@ -44,7 +44,7 @@
     "lodash": "^4.17.21"
   },
   "peerDependencies": {
-    "serverless": "1 || 2",
+    "serverless": "2",
     "typescript": ">=2.2.2"
   },
   "jest": {