Bump golang.org/x/sys from 0.12.0 to 0.13.0

Bumps [golang.org/x/sys](https://github.com/golang/sys) from 0.12.0 to 0.13.0.
- [Commits](golang/sys@v0.12.0...v0.13.0)

---
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 v0.12.0
+require golang.org/x/sys v0.13.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
-golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=