Update net-imap to v0.6.4.1

Stan Hurequested to merge
sh-update-net-imap into master

What does this MR do and why?

Update net-imap to v0.6.4.1

This update fixes CVE-2026-47242, which is a minor security issue that does not appear to affect GitLab.

Relates to https://gitlab.com/gitlab-org/gitlab/-/work_items/600949

Diff: https://my.diffend.io/gems/net-imap/0.6.4/0.6.4.1

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Edited by Stan Hu

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