Automatic merge from submit-queue.
Manually cherrypick #65034 to 1.10
Manually cherrypicking #65034. Using hack/cherry_pick_pull.sh to cherrypick is difficult because that requires cherrypicking #63059 first.
This PR imported the latest jsoniterator library so that case sensitivity during unmarhsaling is optional. The PR also set Kubernetes json serializer to be case sensitive.
Fix#64612.
```release-notes
Kubernetes json deserializer is now case-sensitive to restore compatibility with pre-1.8 servers.
If your config files contains fields with wrong case, the config files will be now invalid.
```
Kubernetes-commit: 32ac1c9073b132b8ba18aa830f46b77dcceb0723
