build(deps): bump sigs.k8s.io/release-sdk from 0.3.0 to 0.4.0

Bumps [sigs.k8s.io/release-sdk](https://github.com/kubernetes-sigs/release-sdk) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/kubernetes-sigs/release-sdk/releases)
- [Commits](kubernetes-sigs/release-sdk@v0.3.0...v0.4.0)

---
updated-dependencies:
- dependency-name: sigs.k8s.io/release-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -30,7 +30,7 @@ require (
 	gopkg.in/src-d/go-git.v4 v4.13.1
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/utils v0.0.0-20210305010621-2afb4311ab10
-	sigs.k8s.io/release-sdk v0.3.0
+	sigs.k8s.io/release-sdk v0.4.0
 	sigs.k8s.io/release-utils v0.3.0
 	sigs.k8s.io/yaml v1.3.0
 )

go.sum

@@ -1401,8 +1401,8 @@ rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.14/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.15/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
-sigs.k8s.io/release-sdk v0.3.0 h1:QFZByTk6XifExaIWajFTrN6QapOwewCuG7zYrboAG+k=
-sigs.k8s.io/release-sdk v0.3.0/go.mod h1:m7EwAKZb9Hua+b8pXnJLMJ/5WY/Fs1CeqxBZYXx0u0A=
+sigs.k8s.io/release-sdk v0.4.0 h1:QxU07rac9r5wOe/QNBHRuMv05RjqwPrrm/bVwCIt+f0=
+sigs.k8s.io/release-sdk v0.4.0/go.mod h1:m7EwAKZb9Hua+b8pXnJLMJ/5WY/Fs1CeqxBZYXx0u0A=
 sigs.k8s.io/release-utils v0.3.0 h1:cyNeXvm+2lPn67f4MWmq9xapZDAI5hekpT7iQPRxta4=
 sigs.k8s.io/release-utils v0.3.0/go.mod h1:J9xpziRNRI4mAeMZxPRryDodQMoMudMu6yC1aViFHU4=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=