increase ci-kubernetes-node-kubelet-serial timeout
increase ci-kubernetes-node-kubelet-serial timeout

https://k8s-testgrid.appspot.com/sig-node-kubelet#kubelet-serial-gce-e2e
is currently failing due to timeouts. I have some new tests in
https://github.com/kubernetes/kubernetes/pull/63221 which will further
increase the test runtime. This PR should fix the current failures and
give us a margin of safety for the new tests.

jlowdermilk/test-infra,kubernetes/test-infra,brahmaroutu/test-infra,dims/test-infra,ixdy/kubernetes-test-infra,kubernetes/test-infra,brahmaroutu/test-infra,jlowdermilk/test-infra,fejta/test-infra,cjwagner/test-infra,ixdy/kubernetes-test-infra,kubernetes/test-infra,fejta/test-infra,cblecker/test-infra,kargakis/test-infra,kargakis/test-infra,cjwagner/test-infra,jessfraz/test-infra,michelle192837/test-infra,mindprince/test-infra,shyamjvs/test-infra,krzyzacy/test-infra,jessfraz/test-infra,abgworrall/test-infra,fejta/test-infra,mindprince/test-infra,monopole/test-infra,pwittrock/test-infra,lavalamp/test-infra,brahmaroutu/test-infra,fejta/test-infra,brahmaroutu/test-infra,BenTheElder/test-infra,cblecker/test-infra,BenTheElder/test-infra,cjwagner/test-infra,mindprince/test-infra,monopole/test-infra,krzyzacy/test-infra,kargakis/test-infra,fejta/test-infra,krzyzacy/test-infra,abgworrall/test-infra,cblecker/test-infra,shyamjvs/test-infra,jessfraz/test-infra,abgworrall/test-infra,pwittrock/test-infra,shyamjvs/test-infra,jessfraz/test-infra,kargakis/test-infra,ixdy/kubernetes-test-infra,cblecker/test-infra,brahmaroutu/test-infra,michelle192837/test-infra,kargakis/test-infra,fejta/test-infra,lavalamp/test-infra,brahmaroutu/test-infra,dims/test-infra,lavalamp/test-infra,michelle192837/test-infra,abgworrall/test-infra,jlowdermilk/test-infra,dims/test-infra,shyamjvs/test-infra,lavalamp/test-infra,kubernetes/test-infra,pwittrock/test-infra,monopole/test-infra,cblecker/test-infra,jessfraz/test-infra,pwittrock/test-infra,cjwagner/test-infra,kargakis/test-infra,michelle192837/test-infra,jlowdermilk/test-infra,cjwagner/test-infra,cblecker/test-infra,dims/test-infra,jlowdermilk/test-infra,michelle192837/test-infra,shyamjvs/test-infra,monopole/test-infra,mindprince/test-infra,dims/test-infra,shyamjvs/test-infra,michelle192837/test-infra,lavalamp/test-infra,BenTheElder/test-infra,cjwagner/test-infra,pwittrock/test-infra,kubernetes/test-infra,mindprince/test-infra,krzyzacy/test-infra,jessfraz/test-infra,dims/test-infra,BenTheElder/test-infra,ixdy/kubernetes-test-infra,monopole/test-infra,BenTheElder/test-infra,ixdy/kubernetes-test-infra,jlowdermilk/test-infra,krzyzacy/test-infra,monopole/test-infra,abgworrall/test-infra,lavalamp/test-infra,krzyzacy/test-infra,kubernetes/test-infra,BenTheElder/test-infra