bump webhook version to v1

[swiftslee]

Signed-off-by: yuswift [email protected]

What this PR does / why we need it:
To support v1.22, we need to bump webhook version to v1.
ref #1445
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 #

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[swiftslee]

/close
#1427 has fixed it

[k8s-ci-robot]

@yuswift: Closed this PR.

In response to this:

/close
#1427 has fixed it

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