Bump golang.org/x/sys from 0.16.0 to 0.18.0

Bumps [golang.org/x/sys](https://github.com/golang/sys) from 0.16.0 to 0.18.0.
- [Commits](golang/sys@v0.16.0...v0.18.0)

---
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>

go.mod

@@ -2,4 +2,4 @@ module github.com/safchain/ethtool
 
 go 1.16
 
-require golang.org/x/sys v0.16.0
+require golang.org/x/sys v0.18.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
-golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=