Bump k8s.io/code-generator from 0.31.1 to 0.31.2 in /tools in the gomod group #5103

Job	Run time
Submariner K8s API Code Generation	1m 20s
Commit Message(s)	11s
No "Apply suggestions from code review" Commits	2s
Go	4m 12s
Dependency Licenses	2m 23s
Protobuf Code Generation	32s
Markdown Links (modified files)	12s
Markdown	9s
Package Documentation	52s
Shell	6s
Variant Analysis	4m 23s
Vulnerability Scanning	24s
YAML	14s
	15m 0s

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