Bump AWSSDK.DynamoDBv2 from 3.7.305.1 to 3.7.400

Bumps [AWSSDK.DynamoDBv2](https://github.com/aws/aws-sdk-net) from 3.7.305.1 to 3.7.400.
- [Changelog](https://github.com/aws/aws-sdk-net/blob/main/SDK.CHANGELOG.MD)
- [Commits](https://github.com/aws/aws-sdk-net/commits/3.7.400.0)

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

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

src/DynamoDBv2.Transactions.csproj

@@ -55,7 +55,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.305.1">
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.400">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
   </ItemGroup>

test/DynamoDBv2.Transactions.Benchmarks/DynamoDBv2.Transactions.Benchmarks.csproj

@@ -16,7 +16,7 @@
   <ItemGroup>
     <PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
     <PackageReference Include="BenchmarkDotNet.Annotations" Version="0.13.12" />
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.305.1" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.400" />
   </ItemGroup>
 
   <ItemGroup>

test/DynamoDBv2.Transactions.IntegrationTests/DynamoDBv2.Transactions.IntegrationTests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.305.1" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.400" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

test/DynamoDBv2.Transactions.UnitTests/DynamoDBv2.Transactions.UnitTests.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.305.1" />
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.400" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>