[Backport release/8.5] fix: remove unused property in pom (#312)

* BACKPORT-CONFLICT

* Update pom.xml

---------

Co-authored-by: Jonathan Lukas <[email protected]>

Author: github-actions[bot]

pom.xml

@@ -18,8 +18,6 @@
     <java.version>${version.java}</java.version>
     <maven.compiler.release>${java.version}</maven.compiler.release>
 
-    <zeebe.version>8.5.7</zeebe.version>
-
     <spring-boot.version>3.3.5</spring-boot.version>
     <commons-beanutils.version>1.9.4</commons-beanutils.version>
     <resilience4j.version>2.2.0</resilience4j.version>