Bump io.nats:jnats from 2.21.5 to 2.23.0 in /examples

Bumps [io.nats:jnats](https://github.com/nats-io/nats.java) from 2.21.5 to 2.23.0.
- [Release notes](https://github.com/nats-io/nats.java/releases)
- [Changelog](https://github.com/nats-io/nats.java/blob/main/CHANGELOG.md)
- [Commits](nats-io/nats.java@2.21.5...2.23.0)

---
updated-dependencies:
- dependency-name: io.nats:jnats
  dependency-version: 2.23.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

examples/nats/build.gradle

@@ -9,7 +9,7 @@ repositories {
 dependencies {
     testImplementation 'org.assertj:assertj-core:3.27.4'
     testImplementation 'org.testcontainers:testcontainers'
-    testImplementation 'io.nats:jnats:2.21.5'
+    testImplementation 'io.nats:jnats:2.23.0'
     testImplementation 'ch.qos.logback:logback-classic:1.3.15'
     testImplementation 'org.apache.httpcomponents:httpclient:4.5.14'
     testImplementation 'org.junit.jupiter:junit-jupiter:5.13.4'