Fix typo in dockerfile

[christophfroehlich]

Wrong version of typing_extensions is installed

2026-04-20T09:39:56.0943782Z <<< error message
2026-04-20T09:39:56.0943875Z The test did not generate a result file:
2026-04-20T09:39:56.0943936Z
2026-04-20T09:39:56.0944100Z usage: launch_test.py [-h] [--package-name PACKAGE_NAME] [-v] [-s]
2026-04-20T09:39:56.0944182Z [--junit-xml XMLPATH]
2026-04-20T09:39:56.0944293Z launch_test_file [launch_arguments ...]
2026-04-20T09:39:56.0944672Z launch_test.py: error: cannot import name 'deprecated' from 'typing_extensions' (/usr/lib/python3/dist-packages/typing_extensions.py)