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>

Author: dependabot[bot]

backend/build.gradle.kts

@@ -26,7 +26,7 @@ dependencies {
     annotationProcessor("io.micronaut.validation:micronaut-validation-processor")
     // When.MAYBE warning fix
     annotationProcessor("com.google.code.findbugs:jsr305:3.0.2")
-    implementation("ch.qos.logback:logback-classic:1.5.5")
+    implementation("ch.qos.logback:logback-classic:1.5.6")
     implementation("org.slf4j:slf4j-api:2.0.13")
     implementation("com.google.code.findbugs:jsr305:3.0.2")
     implementation("io.micronaut.security:micronaut-security-jwt")