Update Rust crate socket2 to v0.6.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
socket2	dependencies	patch	0.6.3 → 0.6.4

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Release Notes

rust-lang/socket2 (socket2)

v0.6.4

• Implement Send for MsgHdr(Mut)
  (#​650).
• Add support for horizonOS/n3ds
  (#​653).
• Switch QNX 8.0 and 7.1 to use TCP_KEEPIDLE instead of TCP_KEEPALIVE
  (#​654).
• Fixed an issue on Windows where for Socket::only_v6 sometimes booleans are 1
  byte other times it's 4 bytes
  (#​655).

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