Bump net.logstash.logback:logstash-logback-encoder in /apps/backend

Bumps [net.logstash.logback:logstash-logback-encoder](https://github.com/logfellow/logstash-logback-encoder) from 7.4 to 8.0.
- [Release notes](https://github.com/logfellow/logstash-logback-encoder/releases)
- [Commits](logfellow/logstash-logback-encoder@logstash-logback-encoder-7.4...logstash-logback-encoder-8.0)

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

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

apps/backend/pom.xml

@@ -26,7 +26,7 @@
         <hypersistence-utils-hibernate-63.version>3.8.1</hypersistence-utils-hibernate-63.version>
         <springdoc-openapi-starter-webmvc-ui.version>2.6.0</springdoc-openapi-starter-webmvc-ui.version>
         <simpleclient.version>0.16.0</simpleclient.version>
-        <logstash-logback-encoder.version>7.4</logstash-logback-encoder.version>
+        <logstash-logback-encoder.version>8.0</logstash-logback-encoder.version>
         <docx4j.version>11.4.11</docx4j.version>
         <google-cloud-bigquery.version>2.38.2</google-cloud-bigquery.version>