build(deps): bump golang.org/x/sys from 0.3.0 to 0.4.0

Bumps [golang.org/x/sys](https://github.com/golang/sys) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/golang/sys/releases)
- [Commits](https://github.com/golang/sys/compare/v0.3.0...v0.4.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sys
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/golang.org/x/sys/unix/mkall.sh

@@ -174,10 +174,10 @@ openbsd_arm64)
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
 	;;
 openbsd_mips64)
+	mkasm="go run mkasm.go"
 	mkerrors="$mkerrors -m64"
-	mksyscall="go run mksyscall.go -openbsd"
+	mksyscall="go run mksyscall.go -openbsd -libc"
 	mksysctl="go run mksysctl_openbsd.go"
-	mksysnum="go run mksysnum.go 'https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
 	# Let the type of C char be signed for making the bare syscall
 	# API consistent across platforms.
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"