C#: Update Aws test files.

Author: michaelnebel

csharp/ql/test/library-tests/frameworks/Aws/lambda.ql

@@ -1,5 +1,5 @@
 import csharp
-import semmle.code.csharp.dataflow.ExternalFlow
+import semmle.code.csharp.dataflow.internal.ExternalFlow
 
 query predicate awsRemoteSources(DataFlow::ExprNode node) { sourceNode(node, "remote") }
 

csharp/ql/test/library-tests/frameworks/Aws/options

@@ -1 +1,3 @@
-semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/Amazon.Lambda/2.1.0/Amazon.Lambda.csproj
+semmle-extractor-options: /nostdlib /noconfig
+semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/Amazon.Lambda.Core/2.2.0/Amazon.Lambda.Core.csproj
+semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/Amazon.Lambda.APIGatewayEvents/2.7.0/Amazon.Lambda.APIGatewayEvents.csproj