Bump k8s.io/code-generator from 0.30.3 to 0.31.0 in /tools in the gomod group #4966

Job	Run time
No "Apply suggestions from code review" Commits	3s
Submariner K8s API Code Generation	1m 19s
Commit Message(s)	12s
Go	3m 9s
Dependency Licenses	2m 4s
Markdown Links (modified files)	9s
Markdown	10s
Package Documentation	44s
Protobuf Code Generation	29s
Shell	9s
Variant Analysis	3m 4s
Vulnerability Scanning	23s
YAML	8s
	12m 3s

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