Bump Testcontainers from 3.10.0 to 4.0.0

Bumps [Testcontainers](https://github.com/testcontainers/testcontainers-dotnet) from 3.10.0 to 4.0.0.
- [Release notes](https://github.com/testcontainers/testcontainers-dotnet/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-dotnet/blob/develop/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-dotnet@3.10.0...4.0.0)

---
updated-dependencies:
- dependency-name: Testcontainers
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

test/FluentRest.Tests/FluentRest.Tests.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" />
-    <PackageReference Include="Testcontainers" Version="3.10.0" />
+    <PackageReference Include="Testcontainers" Version="4.0.0" />
     <PackageReference Include="XUnit.Hosting" Version="1.7.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>