🐛 Minor upgrade of gnostic to v0.3.1

[fejta]

🐛

ref google/gnostic#147 and #583

People cannot patch upgrade controller-runtime without this change, because https://proxy.golang.org/github.com/googleapis/gnostic/@v/list reports a zombie v0.2.1 release

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[DirectXMan12]

/lgtm
/approve

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