Merge pull request #470 from eregon/update-net-imap #1679

Job	Run time
benchmark-run-once	1m 37s
benchmark-graph	1m 7s
test (truffleruby)	1m 50s
test (ruby)	1m 12s
benchmark-ractor (head)	6m 57s
benchmark-default (head)	14m 6s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 6s
benchmark-ractor-only (head)	1m 5s
benchmark-default (ruby)	13m 21s
test (head)	57s
all-tests	4s
	55m 22s

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