Increment version to 0.6.0-preview.1+1.21.5

Author: ErrorCraft

gradle.properties

@@ -8,7 +8,7 @@ org.gradle.jvmargs=-Xmx1G
 	loader_version=0.18.4
 
 # Mod Properties
-	mod_version = 0.5.0+1.21.3
+	mod_version = 0.6.0-preview.1+1.21.5
 	maven_group = net.errorcraft
 	archives_base_name = itematic