Proactively bump to v0.12.0 to avoid v0.10.0 and v0.11.0, which contain
a regression added by commit
82780d606d.
This commit was later reverted in v0.12.0.
Generated with:
hack/pin-dependency.sh golang.org/x/net v0.12.0 && hack/update-vendor.sh
Gomega adds support for formatting extensions and StopTrying in matchers.
Ginkgo enhances DeferCleanup.
This also triggered an update of other dependencies.