fix: fix case sensitivity issue

- Turns out CLI is now lower case, and it MacOS is case insensitive and didn't notice

Author: NoxHarmonium

lib/modules.d.ts

@@ -1,5 +1,5 @@
 // I don't think that serverless export these types (although I only had a cursory look)
 // We can have a better look as part of https://github.com/agiledigital/serverless-sns-sqs-lambda/issues/313
 // Declaring these modules keeps tsc happy (they are implicitly any)
-declare module "serverless/lib/classes/CLI";
+declare module "serverless/lib/classes/cli";
 declare module "serverless/lib/plugins/aws/provider";

lib/serverless-sns-sqs-lambda.test.ts

@@ -1,6 +1,6 @@
 "use strict";
 
-import CLI from "serverless/lib/classes/CLI";
+import CLI from "serverless/lib/classes/cli";
 import AwsProvider from "serverless/lib/plugins/aws/provider";
 import ServerlessSnsSqsLambda from "./serverless-sns-sqs-lambda";