Use context managers for opening files #335
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I have been getting
ResourceWarning
s for some calls toVersion.from_files
viaboard.pin_upload
. I think it's due to un-closed file managers. In this PR I just enable a Ruff rule to detect this situation, and refactor to comply with the rule.https://docs.astral.sh/ruff/rules/open-file-with-context-handler/