Bug: Module 'typing_extensions' not found, not listed as dependency

**Describe the bug**



I got this error today:



```

Traceback:

/usr/lib/python3.10/importlib/__init__.py:126: in import_module

    return _bootstrap._gcd_import(name[level:], package, level)

tests/integration_test.py:6: in <module>

    from testcontainers.localstack import LocalStackContainer

../../../../.local/lib/python3.10/site-packages/testcontainers/localstack/__init__.py:19: in <module>

    from testcontainers.core.container import DockerContainer

../../../../.local/lib/python3.10/site-packages/testcontainers/core/container.py:7: in <module>

    from typing_extensions import Self

E   ModuleNotFoundError: No module named 'typing_extensions'

```



Our testcontainers dependency is not pinned to a version, and today it pulled in 4.3.2 and failed with above error.

After rolling back to 4.3.1 the error was gone.



The problem seems to be that typing_extensions is not listed as dependency in pyproject.toml.



**To Reproduce**



Use testcontainers in a clean environment, meaning that it doesn't have any preinstalled typing_extensions module.

In our case, this is a Github Actions runner.



**Runtime environment**



Doesn't seem relevant at this time, but will provide if necessary.

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