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]

gradle/libs.versions.toml

@@ -34,7 +34,7 @@ spring-data = { module ="org.springframework.data:spring-data-commons", version.
 checker = "org.checkerframework:checker:3.52.0"
 jimfs = "com.google.jimfs:jimfs:1.3.1"
 slf4j = "org.slf4j:slf4j-api:2.0.17"
-logback = "ch.qos.logback:logback-classic:1.5.20"
+logback = "ch.qos.logback:logback-classic:1.5.21"
 
 kotest-bom = "io.kotest:kotest-bom:6.0.4"
 kotest-runner = { module = "io.kotest:kotest-runner-junit5" }