Bump io.cloudevents:cloudevents-core from 2.5.0 to 3.0.0 (#610)

Bumps [io.cloudevents:cloudevents-core](https://github.com/cloudevents/sdk-java) from 2.5.0 to 3.0.0.
- [Release notes](https://github.com/cloudevents/sdk-java/releases)
- [Commits](cloudevents/sdk-java@2.5.0...3.0.0)

---
updated-dependencies:
- dependency-name: io.cloudevents:cloudevents-core
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

core/build.gradle

@@ -24,7 +24,7 @@ dependencies {
 
     // Used in samples
     implementation group: 'commons-configuration', name: 'commons-configuration', version: '1.10'
-    implementation group: 'io.cloudevents', name: 'cloudevents-core', version: '2.5.0'
+    implementation group: 'io.cloudevents', name: 'cloudevents-core', version: '3.0.0'
     implementation group: 'io.cloudevents', name: 'cloudevents-api', version: '2.5.0'
     implementation group: 'io.cloudevents', name: 'cloudevents-json-jackson', version: '3.0.0'
     implementation group: 'io.serverlessworkflow', name: 'serverlessworkflow-api', version: '4.0.5.Final'