chore(deps): bump com.slack.api:slack-app-backend from 1.44.1 to 1.44.2

Bumps [com.slack.api:slack-app-backend](https://github.com/slackapi/java-slack-sdk) from 1.44.1 to 1.44.2.
- [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@v1.44.1...v1.44.2)

---
updated-dependencies:
- dependency-name: com.slack.api:slack-app-backend
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -86,7 +86,7 @@ dependencies {
     // Slack
     implementation 'com.slack.api:slack-api-model:1.44.1'
     implementation 'com.slack.api:slack-api-client:1.44.1'
-    implementation 'com.slack.api:slack-app-backend:1.44.1'
+    implementation 'com.slack.api:slack-app-backend:1.44.2'
 
     // XSS Filter
     implementation 'com.navercorp.lucy:lucy-xss-servlet:2.0.1' // Lucy XSS Servlet Filter