chore(deps): bump AWSSDK.Core and AWSSDK.KeyManagementService

Bumps [AWSSDK.Core](https://github.com/aws/aws-sdk-net) and [AWSSDK.KeyManagementService](https://github.com/aws/aws-sdk-net). These dependencies needed to be updated together.

Updates `AWSSDK.Core` from 3.7.304.2 to 3.7.400.56
- [Release notes](https://github.com/aws/aws-sdk-net/releases)
- [Changelog](https://github.com/aws/aws-sdk-net/blob/main/SDK.CHANGELOG.MD)
- [Commits](https://github.com/aws/aws-sdk-net/commits)

Updates `AWSSDK.KeyManagementService` from 3.7.304 to 3.7.400.56
- [Release notes](https://github.com/aws/aws-sdk-net/releases)
- [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.Core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: AWSSDK.KeyManagementService
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

ComAmazonawsKms/runtimes/net/AWS-KMS.csproj

@@ -58,8 +58,8 @@
 
   <ItemGroup>
     <PackageReference Include="DafnyRuntime" Version="[4.2.0,$(DafnyVersion)]" />
-    <PackageReference Include="AWSSDK.Core" Version="3.7.304.16" />
-    <PackageReference Include="AWSSDK.KeyManagementService" Version="3.7.304" />
+    <PackageReference Include="AWSSDK.Core" Version="3.7.400.56" />
+    <PackageReference Include="AWSSDK.KeyManagementService" Version="3.7.400.56" />
     <ProjectReference Include="../../../StandardLibrary/runtimes/net/STD.csproj" />
     <!--
       System.Collections.Immutable can be removed once dafny.msbuild is updated with