Bump golang.org/x/sys from 0.18.0 to 0.19.0

[dependabot[bot]]

Bumps golang.org/x/sys from 0.18.0 to 0.19.0.

Commits

• cabba82 windows: use uint32 for serial comm flags for consistency
• 1a50d97 windows: add serial comm functions
• 95f07ec x/sys/windows: add func windows.DisconnectNamedPipe(handle Handle) (err error)
• 4be02d3 unix: expose mmap calls on z/OS
• See full diff in compare view

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