build(deps): bump ch.qos.logback:logback-classic from 1.5.20 to 1.5.21

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.20 to 1.5.21.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.5.20...v_1.5.21)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.5.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -14,7 +14,7 @@ repositories {
 }
 
 dependencies {
-	implementation("ch.qos.logback:logback-classic:1.5.20")
+	implementation("ch.qos.logback:logback-classic:1.5.21")
 	// ***** SOCKET MODE DEPENDENCIES ***** -->
 	implementation("com.slack.api:bolt:1.46.0")
 	implementation("com.slack.api:bolt-socket-mode:1.46.0")