promote andrewsykim to approver in test/OWNERS

out of 200 most recently updated merged PRs in 'kubernetes/kubernetes' involving 'andrewsykim'...
85 touched files matching regex '^test/'
of those, andrewsykim authored 8, and commented '/lgtm' on 34

I read through a number of reviews, they're substantive feedback
and not rubber stamps.  Keep up the good work!

test/OWNERS

@@ -21,12 +21,12 @@ reviewers:
   - zmerlynn
   - vishh
   - xichengliudui
-  - andrewsykim
   - neolit123
   - stevesloka
   - johnSchnake
   - SataQiu
 approvers:
+  - andrewsykim
   - bowei # for test/e2e/{dns*,network}.go
   - cblecker
   - rramkumar1