Bump net.logstash.logback:logstash-logback-encoder from 4.10 to 8.1

---
updated-dependencies:
- dependency-name: net.logstash.logback:logstash-logback-encoder
  dependency-version: '8.1'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle.kts

@@ -12,7 +12,7 @@ val springMockkVersion = "4.0.2"
 val confluent = "7.9.0"
 val isdialogmoteSchema = "1.0.5"
 val jsoupVersion = "1.21.1"
-val logstashVersion = "4.10"
+val logstashVersion = "8.1"
 val javaxInjectVersion = "1"
 val owaspSanitizerVersion = "20240325.1"
 val apacheCommonsTextVersion = "1.14.0"