chore(deps): update dependency testcontainers to v4

Author: renovate[bot]

Client.IntegrationTests/Client.IntegrationTests.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="nunit" Version="3.14.0"/>
     <PackageReference Include="NUnit3TestAdapter" Version="5.2.0"/>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1"/>
-    <PackageReference Include="TestContainers" Version="3.8.0"/>
+    <PackageReference Include="TestContainers" Version="4.8.1"/>
     <PackageReference Update="StyleCop.Analyzers" Version="1.1.118"/>
   </ItemGroup>