chore(deps): bump Testcontainers

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/Altinn.Platform.Authentication.Tests/Altinn.Platform.Authentication.Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="Altinn.Authorization.ABAC" Version="0.0.8" />
     <PackageReference Include="Altinn.Platform.Storage.Interface" Version="4.0.2" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
-    <PackageReference Include="Testcontainers" Version="3.10.0" />
+    <PackageReference Include="Testcontainers" Version="4.0.0" />
     <PackageReference Include="Testcontainers.PostgreSql" Version="3.10.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.10" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />