build(deps): bump golang.org/x/image in /test/integration

Bumps [golang.org/x/image](https://github.com/golang/image) from 0.0.0-20220302094943-723b81ca9867 to 0.18.0.
- [Commits](https://github.com/golang/image/commits/v0.18.0)

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

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