Update to Minecraft 1.18-pre8

By: md_5 <git@md-5.net>

paper-api/pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>org.bukkit</groupId>
     <artifactId>bukkit</artifactId>
-    <version>1.18-pre5-R0.1-SNAPSHOT</version>
+    <version>1.18-pre8-R0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>Bukkit</name>