Update node version to 20

Author: andyjaar

.travis.yml

@@ -13,9 +13,9 @@ script:
 
 deploy:
   provider: lambda
-  role: "arn:aws:iam::057188795804:role/sendgrid-eventkit"
-  region: "eu-west-2"
-  function_name: "sendgrid-eventkit"
-  handler_name: "handler"
-  runtime: "nodejs12.x"
+  role: 'arn:aws:iam::057188795804:role/sendgrid-eventkit'
+  region: 'eu-west-2'
+  function_name: 'sendgrid-eventkit'
+  handler_name: 'handler'
+  runtime: 'nodejs20.x'
   timeout: 10