[Build-deps]: Bump golang.org/x/sys from 0.18.0 to 0.21.0

[dependabot[bot]]

Bumps golang.org/x/sys from 0.18.0 to 0.21.0.

Commits

• 673e0f9 unix: skip ethtool driver test for busy interface
• 6943ab6 unix/linux: update glibc to 2.39
• 92f3ad6 unix: update to Linux kernel 6.9
• f34bb9f windows: add net user enum
• 6dfb94e unix: add types for SOCK_DIAG
• 7d69d98 unix: extend support for z/OS
• 7758090 cpu: add support for sve2 detection
• 9a28524 windows: drop go version tags for unsupported versions
• 27dc90b unix: update to Linux kernel 6.4
• cabba82 windows: use uint32 for serial comm flags for consistency
• Additional commits viewable in compare view

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