feat!: Support AWSSDK.DynamoDB v4 (#173)

Author: jsonbailey

pkgs/dotnet-server-sdk-dynamodb/src/LaunchDarkly.ServerSdk.DynamoDB.csproj

@@ -23,7 +23,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="[3.3.15.2,4.0.0.0)" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="[4.0.0.0,5.0.0.0)" />
     <PackageReference Include="LaunchDarkly.ServerSdk" Version="[8.0.0,9.0.0)" />
   </ItemGroup>