Remove redundant `javaVersion` property

pom.xml

diff --git a/pom.xml b/pom.xml
index 4471407..5ae3f7f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,7 +56,6 @@
   </distributionManagement>
 
   <properties>
-    <javaVersion>8</javaVersion>
     <project.build.outputTimestamp>2026-10-23T19:46:54Z</project.build.outputTimestamp>
   </properties>