Bump logback-classic from 1.2.3 to 1.2.11

Bumps logback-classic from 1.2.3 to 1.2.11.

---
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>

build.gradle

@@ -7,7 +7,7 @@ ext {
     proxyBaseVersion = "0.0.16"
     testContainersVersion = "1.15.3"
     junit4Version = "4.11"
-    libLogback = 'ch.qos.logback:logback-classic:1.2.3'
+    libLogback = 'ch.qos.logback:logback-classic:1.2.11'
     libKafkaClient = "org.apache.kafka:kafka-clients:$kafkaClientVersion"
     libProxyBase = "com.dajudge.proxybase:proxybase:$proxyBaseVersion"
     libProxyBaseTestca = "com.dajudge.proxybase:testca:$proxyBaseVersion"