build(deps): bump logstash-logback-encoder from 6.4 to 6.6

Bumps [logstash-logback-encoder](https://github.com/logstash/logstash-logback-encoder) from 6.4 to 6.6.
- [Release notes](https://github.com/logstash/logstash-logback-encoder/releases)
- [Commits](logfellow/logstash-logback-encoder@logstash-logback-encoder-6.4...logstash-logback-encoder-6.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -29,7 +29,7 @@ dependencies {
 
     implementation 'io.micrometer:micrometer-registry-prometheus:1.5.3'
     implementation 'ch.qos.logback:logback-classic:1.2.3'
-    implementation 'net.logstash.logback:logstash-logback-encoder:6.4'
+    implementation 'net.logstash.logback:logstash-logback-encoder:6.6'
     implementation 'fi.solita.clamav:clamav-client:1.0.1'
 
     compileOnly 'org.projectlombok:lombok'