xUnit tests run in a deadlock in certain circumstances

[HofmeisterAn]

Describe the bug.

xUnit tests are not executed successfully with enabled xUnit property maxParallelThreads.

To reproduce.

1. Open src/DotNet.Testcontainers.Tests/xunit.runner.json.
2. Change the property maxParallelThreads to 1.
3. Execute PostgreSqlTestcontainerTest test.

Expected behavior.

xUnit tests are not blocked and executed successfully.

Screenshots.

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Desktop (please complete the following information).

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Additional context.

xUnit has it's own synchronization contexts. As soon as we enable the xUnit property maxParallelThreads, our tests are deadlocked (1; 2). If we remove following two lines 1 and 2 our tests run perfectly fine. Replace those two lines with code that does not block the context at all.