Update x/sys to fix darwin builds

[viraptor]

Prevent the darwin build with new golang failing with:

# golang.org/x/sys/unix
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:28:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:43:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:59:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:75:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:90:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:105:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:121:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:136:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:151:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:166:3: //go:linkname must refer to declared function or variable
vendor/golang.org/x/sys/unix/zsyscall_darwin_amd64.go:166:3: too many errors

[dwisiswant0]

This is not necessary, can you bump with #29 (comment) way instead.

[viraptor]

There's more changes than go get -u ... needed. Updating just the module:

# golang.org/x/sys/unix
vendor/golang.org/x/sys/unix/syscall.go:83:16: unsafe.Slice requires go1.17 or later (-lang was set to go1.16; check go.mod)
vendor/golang.org/x/sys/unix/syscall_darwin.go:95:8: unsafe.Slice requires go1.17 or later (-lang was set to go1.16; check go.mod)
vendor/golang.org/x/sys/unix/syscall_unix.go:118:7: unsafe.Slice requires go1.17 or later (-lang was set to go1.16; check go.mod)
vendor/golang.org/x/sys/unix/sysvshm_unix.go:33:7: unsafe.Slice requires go1.17 or later (-lang was set to go1.16; check go.mod)

Updating the version in go.mod to go1.17:

go: updates to go.mod needed; to update it:
        go mod tidy

go mod tidy -> results in this PR.