kube-proxy config burst use int

[hzxuzhonghu]

What this PR does / why we need it:

fix todo, ClientConnectionConfiguration.Burst use type int instead of int32 to prevent extra type cast.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Release note:

NONE

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[hzxuzhonghu]

/assign @thockin

[xiangpengzhao]

FYI: #53850. Seems like int32 is expected.

/cc @dougm @thockin

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In response to this:

FYI: #53850. Seems like int32 is expected.

/cc @dougm @thockin

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[hzxuzhonghu]

@xiangpengzhao Thanks, I see.