[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3591: Use pip cache in GitHub Actions

[Tahoe-LAFS]

#3591: Use pip cache in GitHub Actions
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 Reporter:  sajith   |          Owner:  sajith
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 This could offer a slight speedup in CI.

 Downloading packages from PyPI.org less often is probably a good idea too:
 we could be a little more considerate about PyPI's hosting bills.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3591>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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