Bump co.elastic.logging:log4j2-ecs-layout from 1.5.0 to 1.6.0

Bumps [co.elastic.logging:log4j2-ecs-layout](https://github.com/elastic/ecs-logging-java) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/elastic/ecs-logging-java/releases)
- [Commits](elastic/ecs-logging-java@v1.5.0...v1.6.0)

---
updated-dependencies:
- dependency-name: co.elastic.logging:log4j2-ecs-layout
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

log4j-parent/pom.xml

@@ -123,7 +123,7 @@
     <lightcouch.version>0.2.0</lightcouch.version>
     <log4j.version>1.2.17</log4j.version>
     <log4j2-cachefile-transformer.version>2.15.0</log4j2-cachefile-transformer.version>
-    <log4j2-ecs-layout.version>1.5.0</log4j2-ecs-layout.version>
+    <log4j2-ecs-layout.version>1.6.0</log4j2-ecs-layout.version>
     <logback.version>1.3.14</logback.version>
     <maven.version>3.9.6</maven.version>
     <mockito.version>4.11.0</mockito.version>