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gh-150579: use lazy imports for concurrent.futures (GH-150585)
This module has a manual lazy import hack using `__getattr__`. Now that lazy imports exist and cannot be disabled, this could use lazy imports instead.
Key differences: this will now show up in sys.lazy_modules when accessed. Error messages should be a bit better without the wrapper `__getattr__` involved. That's the only differences I can think of.
(cherry picked from commit 423ae0ff36)
Signed-off-by: Henry Schreiner <henryfs@princeton.edu>
Co-authored-by: Henry Schreiner <henryfs@princeton.edu>
Co-authored-by: Gregory P. Smith <greg@krypto.org>