chore(deps): bump golang.org/x/net in /tool

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.0.0-20201021035429-f5854403a974 to 0.7.0.
- [Release notes](https://github.com/golang/net/releases)
- [Commits](https://github.com/golang/net/commits/v0.7.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

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