Restore 1.8 compatibility by shading guava in Spigot versions

bungee/pom.xml

@@ -57,6 +57,7 @@
                             <!--Those classes are already present in BungeeCord version-->
                             <exclude>net.md-5:bungeecord-config</exclude>
                             <exclude>com.google.code.gson:gson</exclude>
+                            <exclude>com.google.guava:guava</exclude>
                         </excludes>
                     </artifactSet>
                     <relocations>