chore(deps): bump com.slack.api:slack-api-client from 1.39.0 to 1.40.2

Bumps [com.slack.api:slack-api-client](https://github.com/slackapi/java-slack-sdk) from 1.39.0 to 1.40.2.
- [Release notes](https://github.com/slackapi/java-slack-sdk/releases)
- [Changelog](https://github.com/slackapi/java-slack-sdk/blob/main/jSlack_changelog.md)
- [Commits](slackapi/java-slack-sdk@v1.39.0...v1.40.2)

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

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

build.gradle

@@ -91,7 +91,7 @@ dependencies {
 
     // Slack
     implementation 'com.slack.api:slack-api-model:1.39.0'
-    implementation 'com.slack.api:slack-api-client:1.39.0'
+    implementation 'com.slack.api:slack-api-client:1.40.2'
     implementation 'com.slack.api:slack-app-backend:1.39.0'
 
     // XSS Filter