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] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -74,7 +74,7 @@ dependencies {
 
   // logging
   implementation "com.typesafe.scala-logging:scala-logging_${scalaVersion}:3.9.6"
-  implementation 'ch.qos.logback:logback-classic:1.5.20'
+  implementation 'ch.qos.logback:logback-classic:1.5.21'
 
   // config
   implementation 'com.typesafe:config:1.4.5'