Bump golang.org/x/net from 0.4.0 to 0.7.0 (#433)

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.4.0 to 0.7.0.
- [Release notes](https://github.com/golang/net/releases)
- [Commits](https://github.com/golang/net/compare/v0.4.0...v0.7.0)

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

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