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] <support@github.com>

Author: dependabot[bot]

build.gradle.kts

@@ -44,7 +44,7 @@ dependencies {
     }
     implementation("org.connectbot:jbcrypt:1.0.2")
 
-    testImplementation("ch.qos.logback:logback-classic:1.5.20")
+    testImplementation("ch.qos.logback:logback-classic:1.5.21")
     testImplementation("commons-codec:commons-codec:1.19.0")
     testImplementation("commons-io:commons-io:2.20.0")
     testImplementation("org.hamcrest:hamcrest:3.0")