Bump ch.qos.logback:logback-classic from 1.5.18 to 1.5.20

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.18 to 1.5.20.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.5.18...v_1.5.20)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.5.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -9,7 +9,7 @@ val ktor_version = "3.0.3"
 val kotlin_version = "2.0.21"
 val kotlinx_datetime_version = "0.6.2"
 val kompendium_version = "4.0.3"
-val logback_version = "1.5.18"
+val logback_version = "1.5.20"
 val logstash_version = "8.1"
 val prometeus_version = "1.15.4"
 val nav_common_version = "3.2025.09.03_08.33-728ff4acbfdb"