Update development packages

[glen-84]

Summary of the changes (Less than 80 chars)

• Update development packages.

[Copilot]

Pull request overview

Updates development/testing dependencies and adjusts test helpers to match updated container tooling APIs.

Changes:

• Bump centralized package versions (coverlet.collector, Microsoft.NET.Test.Sdk, Microsoft.Testing.Extensions.CodeCoverage, Squadron., Testcontainers, xunit.v3.).
• Update RabbitMQ test fixture to use the updated Squadron command invocation API.
• Update OPA test container startup code to use the updated Testcontainers builder API.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Mocha/test/Mocha.Transport.RabbitMQ.Tests/Helpers/RabbitMQFixture.cs	Adapts RabbitMQ test resource command execution to new Squadron API and removes now-unused Docker.DotNet types.
src/HotChocolate/AspNetCore/test/AspNetCore.Authorization.Opa.Tests/OpaProcess/OpaProcess.cs	Updates container construction to the newer Testcontainers ContainerBuilder usage.
src/Directory.Packages.props	Centralized dev/test dependency version bumps, including Squadron 1.0.1 and Testcontainers 4.11.0.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (3a7deb3) to head (31ab4fe).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9439   +/-   ##
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