Bump github.com/cloudevents/sdk-go/v2 in /slack-webhook

Bumps [github.com/cloudevents/sdk-go/v2](https://github.com/cloudevents/sdk-go) from 2.15.0 to 2.15.2.
- [Release notes](https://github.com/cloudevents/sdk-go/releases)
- [Commits](cloudevents/sdk-go@v2.15.0...v2.15.2)

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

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

slack-webhook/go.mod

@@ -8,7 +8,7 @@ replace github.com/chainguard-dev/platform-examples => ../
 
 require (
 	chainguard.dev/sdk v0.1.14
-	github.com/cloudevents/sdk-go/v2 v2.15.0
+	github.com/cloudevents/sdk-go/v2 v2.15.2
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/slack-go/slack v0.12.3
 	k8s.io/api v0.29.1

slack-webhook/go.sum

@@ -1,7 +1,7 @@
 chainguard.dev/sdk v0.1.14 h1:erl6gbg2A3sTPGaTlPQelKlAhPtLpJDbMY+n+lzIsrU=
 chainguard.dev/sdk v0.1.14/go.mod h1:yQv6iDo9kz46FgEZyWHAEqJlBG1SMRX83Mf5Io4NLb8=
-github.com/cloudevents/sdk-go/v2 v2.15.0 h1:aKnhLQhyoJXqEECQdOIZnbZ9VupqlidE6hedugDGr+I=
-github.com/cloudevents/sdk-go/v2 v2.15.0/go.mod h1:lL7kSWAE/V8VI4Wh0jbL2v/jvqsm6tjmaQBSvxcv4uE=
+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/coreos/go-oidc/v3 v3.9.0 h1:0J/ogVOd4y8P0f0xUh8l9t07xRP/d8tccvjHl2dcsSo=
 github.com/coreos/go-oidc/v3 v3.9.0/go.mod h1:rTKz2PYwftcrtoCzV5g5kvfJoWcm0Mk8AF8y1iAQro4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=