Bump net.logstash.logback:logstash-logback-encoder from 7.2 to 7.3

Bumps [net.logstash.logback:logstash-logback-encoder](https://github.com/logfellow/logstash-logback-encoder) from 7.2 to 7.3.
- [Release notes](https://github.com/logfellow/logstash-logback-encoder/releases)
- [Commits](logfellow/logstash-logback-encoder@logstash-logback-encoder-7.2...logstash-logback-encoder-7.3)

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

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

Author: dependabot[bot]

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 val mockkVersion = "1.13.4"
-val logstashVersion = "7.2"
+val logstashVersion = "7.3"
 val testContainersVersion = "1.17.6"
 val springDocVersion = "2.0.2"
 val tokenValidationVersion = "3.0.2"