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]

gradle/libs.versions.toml

@@ -22,4 +22,4 @@ kotlin-coroutines-swing = { group = "org.jetbrains.kotlinx", name = "kotlinx-cor
 kotlin-coroutines-test = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-test", version.ref = "kotlinCoroutines" }
 kotlin-collections-immutable = { group = "org.jetbrains.kotlinx", name = "kotlinx-collections-immutable", version = "0.4.0" }
 kotlin-stdlib-common = { group = "org.jetbrains.kotlin", name = "kotlin-stdlib-common", version.ref = "kotlin" }
-logback-classic = { group = "ch.qos.logback", name = "logback-classic", version = "1.5.20" }
+logback-classic = { group = "ch.qos.logback", name = "logback-classic", version = "1.5.21" }