➕ Add typing-extensions to test requirements for Python < 3.9
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Add
typing-extensionstorequirements-tests.txt, sincetests/test_main.pyimports it,annotated-doc/tests/test_main.py
Line 3 in a8a8b63
…but at the same time, since
typingin the Python standard library provides bothAnnotatedandget_type_hints, adapt the tests to use the standard library instead on Python 3.9 and later, and conditionalize thetyping-extensionsdependency accordingly.