DEP: Update dependency gdown to >=6.4.0,<6.5.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
gdown	>=6.3.0,<6.4.0 → >=6.4.0,<6.5.0

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Release Notes

wkentaro/gdown (gdown)

v6.4.0

Compare Source

Added

• Optional cancellation events for download() and cached_download() interrupt stalled response reads and download waits without shortening network timeouts, raising DownloadCancelled while preserving partial-file cleanup. (#​525)

Changed

• An invalid --speed value now reports the accepted units instead of an internal function name. (#​527)

Removed

• importlib is no longer exported from the gdown package; it was listed in __all__ by accident. (#​526)

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