Bump ch.qos.logback:logback-classic from 1.5.5 to 1.5.6

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.5 to 1.5.6.
- [Commits](qos-ch/logback@v_1.5.5...v_1.5.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -12,4 +12,4 @@ gradle-nexus-publish = { module = "io.github.gradle-nexus:publish-plugin", versi
 jetbrains-annotations = { module = "org.jetbrains:annotations", version = "24.1.0" }
 # test dependencies
 spock-core = { module = "org.spockframework:spock-core", version = "2.3-groovy-4.0" }
-logback-classic = { module = "ch.qos.logback:logback-classic", version = "1.5.5" }
+logback-classic = { module = "ch.qos.logback:logback-classic", version = "1.5.6" }