Bump protobuf to remediate CVE-2024-7254

[alta404]

Bump protobuf to 4.27.5 to remediate CVE-2024-7254

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[yue9944882]

/lgtm

do we want to backport it to the recent releases as well?

[brendandburns]

@yue9944882 this is the backport to release 21. We could also backport to 20 if we wanted to, but no one has asked for it.

/lgtm
/approve

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[brendandburns]

@alta404 this has been released as 21.0.2

https://mvnrepository.com/artifact/io.kubernetes/client-java/21.0.2