Bump nb-connect from 1.0.2 to 1.2.0 in /rust

[dependabot[bot]]

Bumps nb-connect from 1.0.2 to 1.2.0.

Changelog

Sourced from nb-connect's changelog.

Version 1.2.0

• This crate is now deprecated in favor of socket2.

Version 1.1.0

• Increase MSRV to rustc 1.46.
• Update socket2 dependency to 0.4.

Version 1.0.4

• Update socket2 dependency to 0.4.

Version 1.0.3

• Fix invalid assumption of std::net::SocketAddrV{4,6} layout.

Commits

• 758a347 Merge pull request #12 from smol-rs/deprecated
• 21a5cae Deprecate in favor of socket2
• 93ba861 Merge pull request #11 from smol-rs/next
• 2c0d3c2 Bump to v1.1.0
• 5bb8f1c Merge pull request #10 from smol-rs/next
• 4191740 Bump to v1.0.4
• 4307169 Merge pull request #9 from Keruspe/socket2
• 5d0efa8 update socket2 to 0.4.0
• 8cec5f5 Merge pull request #7 from smol-rs/next
• a8a70b0 Bump to v1.0.3
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like nb-connect is no longer a dependency, so this is no longer needed.