Bump github.com/cloudevents/sdk-go/v2 in /hack/e2e/sink

Bumps [github.com/cloudevents/sdk-go/v2](https://github.com/cloudevents/sdk-go) from 2.14.0 to 2.15.2.
- [Release notes](https://github.com/cloudevents/sdk-go/releases)
- [Commits](cloudevents/sdk-go@v2.14.0...v2.15.2)

---
updated-dependencies:
- dependency-name: github.com/cloudevents/sdk-go/v2
  dependency-type: direct:production
...

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

hack/e2e/sink/go.mod

@@ -3,7 +3,7 @@ module github.com/kyma-project/eventing-manager/sink
 go 1.20
 
 require (
-	github.com/cloudevents/sdk-go/v2 v2.14.0
+	github.com/cloudevents/sdk-go/v2 v2.15.2
 	github.com/gorilla/mux v1.8.0
 	go.uber.org/zap v1.10.0
 )

hack/e2e/sink/go.sum

@@ -1,5 +1,5 @@
-github.com/cloudevents/sdk-go/v2 v2.14.0 h1:Nrob4FwVgi5L4tV9lhjzZcjYqFVyJzsA56CwPaPfv6s=
-github.com/cloudevents/sdk-go/v2 v2.14.0/go.mod h1:xDmKfzNjM8gBvjaF8ijFjM1VYOVUEeUfapHMUX1T5To=
+github.com/cloudevents/sdk-go/v2 v2.15.2 h1:54+I5xQEnI73RBhWHxbI1XJcqOFOVJN85vb41+8mHUc=
+github.com/cloudevents/sdk-go/v2 v2.15.2/go.mod h1:lL7kSWAE/V8VI4Wh0jbL2v/jvqsm6tjmaQBSvxcv4uE=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=