Revert "Update version to next snapshot version"

This reverts commit f2de81c.

Author: bevzzz

pom.xml

@@ -5,7 +5,7 @@
   <groupId>io.weaviate</groupId>
   <artifactId>client6</artifactId>
   <packaging>jar</packaging>
-  <version>6.0.0-SNAPSHOT</version>
+  <version>6.0.0-rc1</version>
 
   <name>${project.groupId}:${project.artifactId}</name>
   <description>Official Java client for Weaviate Vector Search Engine</description>