chore(deps): bump AWSSDK.DynamoDBv2

Bumps [AWSSDK.DynamoDBv2](https://github.com/aws/aws-sdk-net) from 3.7.300.2 to 3.7.400.3.
- [Changelog](https://github.com/aws/aws-sdk-net/blob/main/SDK.CHANGELOG.MD)
- [Commits](https://github.com/aws/aws-sdk-net/commits)

---
updated-dependencies:
- dependency-name: AWSSDK.DynamoDBv2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

ComAmazonawsDynamodb/runtimes/net/ComAmazonawsDynamodb.csproj

@@ -58,8 +58,8 @@
 
   <ItemGroup>
     <PackageReference Include="DafnyRuntime" Version="$(DafnyVersion)" />
-    <PackageReference Include="AWSSDK.Core" Version="3.7.304.16" />
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.300.2" />
+    <PackageReference Include="AWSSDK.Core" Version="3.7.400.3" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.400.3" />
     <ProjectReference Include="../../../StandardLibrary/runtimes/net/STD.csproj" />
     <!--
       System.Collections.Immutable can be removed once dafny.msbuild is updated with