Update net-imap in lobsters #1678

Job	Run time
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 12s
benchmark-default (ruby)	13m 16s
test (truffleruby)	1m 53s
benchmark-default (head)	13m 16s
test (ruby)	59s
benchmark-graph	52s
benchmark-run-once	1m 39s
benchmark-ractor-only (head)	39s
benchmark-ractor (head)	6m 53s
test (head)	57s
all-tests	4s
	53m 40s

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