Bump golang.org/x/net from 04a2e54 to 9b4f9f5

Bumps [golang.org/x/net](https://github.com/golang/net) from `04a2e54` to `9b4f9f5`.
- [Release notes](https://github.com/golang/net/releases)
- [Commits](golang/net@04a2e54...9b4f9f5)

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