Bump com.slack.api:bolt from 1.39.+ to 1.40.0 (#5004)

Bumps [com.slack.api:bolt](https://github.com/slackapi/java-slack-sdk) from 1.39.+ to 1.40.0.
- [Release notes](https://github.com/slackapi/java-slack-sdk/releases)
- [Changelog](https://github.com/slackapi/java-slack-sdk/blob/main/jSlack_changelog.md)
- [Commits](https://github.com/slackapi/java-slack-sdk/commits/v1.40.0)

---
updated-dependencies:
- dependency-name: com.slack.api:bolt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

eventmesh-connectors/eventmesh-connector-slack/build.gradle

@@ -20,7 +20,7 @@ dependencies {
     implementation project(":eventmesh-sdks:eventmesh-sdk-java")
     implementation project(":eventmesh-openconnect:eventmesh-openconnect-java")
 
-    implementation "com.slack.api:bolt:1.39.+"
+    implementation "com.slack.api:bolt:1.40.+"
     implementation 'com.google.guava:guava'
 
     compileOnly 'org.projectlombok:lombok'