Update Testcontainers nuget package to 4.12.0

[MD-V]

Updates Testcontainers nuget package to 4.12.0 and fix breaking changes as Testcontainers now uses Docker.DotNet.Enhanced instead of Docker.DotNet.

References

• https://github.com/testcontainers/Docker.DotNet/pull/65/changes#diff-47866ccf8b0e7847797f0307137036fc2608128c2dfac9f33bb746710934303d
• https://github.com/testcontainers/Docker.DotNet/pull/65/changes#diff-a944f48314882e7cae293af14f782fdae674e6af5e12fc2f0abeb705cd3c17b7

Submitter checklist

• Recommended: Join WireMock Slack to get any help in #help-contributing or a project-specific channel like #wiremock-java
• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• The repository's code style is followed (see the contributing guide)
• Test coverage that demonstrates that the change works as expected
• For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Testcontainers dependency and adapts Docker client creation to the newer API.

Changes:

• Bump Testcontainers NuGet package from 4.10.0 to 4.12.0
• Replace GetDockerClientConfiguration().CreateClient() with GetDockerClientBuilder().Build() in utility and example code

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/WireMock.Net.Testcontainers/WireMock.Net.Testcontainers.csproj	Updates Testcontainers package version to 4.12.0
src/WireMock.Net.Testcontainers/Utils/TestcontainersUtils.cs	Migrates Docker client instantiation to the newer builder-based API
examples/WireMock.Net.TestcontainersExample/Program.cs	Mirrors the builder-based Docker client instantiation in the example

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