Bump socket2 from 0.3.11 to 0.3.12 (#523)
Bump socket2 from 0.3.11 to 0.3.12 (#523)

Bumps [socket2](https://github.com/alexcrichton/socket2-rs) from 0.3.11 to 0.3.12.
- [Release notes](https://github.com/alexcrichton/socket2-rs/releases)
- [Commits](https://github.com/alexcrichton/socket2-rs/compare/0.3.11...0.3.12)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
alex/ct-tools,alex/ct-tools