Bump Testcontainers from 4.0.0 to 4.1.0 (#24)

Bumps [Testcontainers](https://github.com/testcontainers/testcontainers-dotnet) from 4.0.0 to 4.1.0.
- [Release notes](https://github.com/testcontainers/testcontainers-dotnet/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-dotnet/blob/develop/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-dotnet@4.0.0...4.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test/Styra.Opa.AspNetCore.Tests/Styra.Opa.AspNetCore.Tests.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="8.0.11" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="Testcontainers" Version="4.0.0" />
+    <PackageReference Include="Testcontainers" Version="4.1.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>