Eliminate unused Layer from streaming Lambda setup

Removed unused Layer configuration for Lambda function.

Author: rix0rrr

packages/amplify-graphql-searchable-transformer/src/cdk/create-streaming-lambda.ts

@@ -31,18 +31,7 @@ export const createLambda = (
     parameterMap.get(OpenSearchStreamingLambdaHandlerName)!.valueAsString,
     path.resolve(__dirname, '..', '..', 'lib', 'streaming-lambda.zip'),
     Runtime.PYTHON_3_12,
-    [
-      // Let's avoid using the Layer, it's only there to keep on bringing the 'requests' dependency
-      // for people who transitively depend on it; but we don't, so we can use the version of boto3 that
-      // comes with Lambda by default.
-      /*
-      LayerVersion.fromLayerVersionArn(
-        scope,
-        'LambdaLayerVersion',
-        Fn.findInMap('LayerResourceMapping', Fn.ref('AWS::Region'), 'layerRegion'),
-      ),
-      */
-    ],
+    [],
     lambdaRole,
     enviroment,
     undefined,