Bump k8s.io/code-generator from 0.19.14 to 0.19.15 (#178)

Bumps [k8s.io/code-generator](https://github.com/kubernetes/code-generator) from 0.19.14 to 0.19.15.
- [Release notes](https://github.com/kubernetes/code-generator/releases)
- [Commits](kubernetes/code-generator@v0.19.14...v0.19.15)

---
updated-dependencies:
- dependency-name: k8s.io/code-generator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -9,6 +9,6 @@ require (
 	k8s.io/api v0.19.15
 	k8s.io/apimachinery v0.19.15
 	k8s.io/client-go v0.19.15
-	k8s.io/code-generator v0.19.14
+	k8s.io/code-generator v0.19.15
 	knative.dev/pkg v0.0.0-20210331065221-952fdd90dbb0 // pin to branch release-0.22
 )

go.sum

@@ -1074,8 +1074,8 @@ k8s.io/client-go v0.19.7/go.mod h1:iytGI7S3kmv6bWnn+bSQUE4VlrEi4YFssvVB7J7Hvqg=
 k8s.io/client-go v0.19.15 h1:lDBvFBjDIExh0mFS6JbG+5B7ghuPhqXjBzlaxG81ToU=
 k8s.io/client-go v0.19.15/go.mod h1:OJMQWgHQJRDtO2BVtpkHUQOq/e5WHpXc02lSdPI0S/k=
 k8s.io/code-generator v0.19.7/go.mod h1:lwEq3YnLYb/7uVXLorOJfxg+cUu2oihFhHZ0n9NIla0=
-k8s.io/code-generator v0.19.14 h1:EFU42Hj0+FBZciWedyRtFHsPu75IaWca0slGB1LlBqk=
-k8s.io/code-generator v0.19.14/go.mod h1:ADrDvaUQWGn4a8lX0ONtzb7uFmDRQOMSYIMk1qWIAx8=
+k8s.io/code-generator v0.19.15 h1:aQ6jFz1aym4tuU+wnzr8AaQbVahW+DI7YwoQc4qHlhU=
+k8s.io/code-generator v0.19.15/go.mod h1:ADrDvaUQWGn4a8lX0ONtzb7uFmDRQOMSYIMk1qWIAx8=
 k8s.io/component-base v0.19.7/go.mod h1:YX8spPBgwl3I6UGcSdQiEMAqRMSUsGQOW7SEr4+Qa3U=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/gengo v0.0.0-20200428234225-8167cfdcfc14 h1:t4L10Qfx/p7ASH3gXCdIUtPbbIuegCoUJf3TMSFekjw=