net/rustconn: Update to 0.16.7

ChangeLog:

• https://github.com/totoshko88/RustConn/releases/tag/v0.16.3
• https://github.com/totoshko88/RustConn/releases/tag/v0.16.4
• https://github.com/totoshko88/RustConn/releases/tag/v0.16.5
• https://github.com/totoshko88/RustConn/releases/tag/v0.16.6
• https://github.com/totoshko88/RustConn/releases/tag/v0.16.7

Reported by: "github-actions[bot]" <notifications@github.com>