Bump AWSSDK.SecurityToken from 4.0.4 to 4.0.5.1

---
updated-dependencies:
- dependency-name: AWSSDK.SecurityToken
  dependency-version: 4.0.5.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minor-and-patch
...

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

Author: dependabot[bot]

csharp/AppEncryption/AppEncryption.IntegrationTests/AppEncryption.IntegrationTests.csproj

@@ -10,7 +10,7 @@
         <NoWarn>$(NoWarn);CA1873</NoWarn>
     </PropertyGroup>
     <ItemGroup Label="Package References">
-        <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.4" />
+        <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.5.1" />
         <PackageReference Include="coverlet.msbuild" Version="6.0.4">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

csharp/AppEncryption/AppEncryption.Tests/AppEncryption.Tests.csproj

@@ -9,7 +9,7 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup Label="Package References">
-    <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.4" />
+    <PackageReference Include="AWSSDK.SecurityToken" Version="4.0.5.1" />
     <PackageReference Include="JunitXml.TestLogger" Version="7.0.2" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.4">
       <PrivateAssets>all</PrivateAssets>