[golang] go1.14.7 and go1.13.15 security updates

[justaugustus]

What would you like to be added:

Tracking issue for go1.14.7 and go1.13.15 security updates
Announcement: https://groups.google.com/d/topic/golang-announce/NyPIaucMgXo/discussion

Work items:

• kube-cross bump: kube-cross: Build v1.14.7-1 and v1.13.15-1 images #1473
• image promotion: build-image: Promote kube-cross:v1.14.7-1 and v1.13.15-1 k8s.io#1119
• k/release/k8s-cloud-builder bump: k8s-cloud-builder: Build on kube-cross:v1.14.7-1 and v1.13.15-1 #1475
• k/repo-infra bump: Update to [email protected] and add go1.15rc2 SDK repo-infra#205
• k/repo-infra release cut: https://github.com/kubernetes/repo-infra/releases/tag/v0.0.11
• kubekins/krte variants bump: releng(kubekins, krte): Update Golang versions test-infra#18758
• publishing-bot bump: publishing-bot: Use go1.15.0 as default version and go1.13.15 for previous releases kubernetes#93998

go1.14.7

N/A -- master and release-1.19 are moving towards go1.15

go1.13.15

• k/k bump (release-1.18): [1.18][go1.13] Update to go1.13.15 kubernetes#93953
  • k/k bazel rules_go: [1.18][go1.13] Update to go1.13.15 kubernetes#93953

Cherry picks

• 1.17: [1.17][go1.13] Update to go1.13.15 kubernetes#93955
• 1.16: [1.16][go1.13] Update to go1.13.15 kubernetes#93956

/assign
/area dependency
cc: @kubernetes/release-engineering