TOMEE-2116 upgrade to apache-parent-18

diff --git a/pom.xml b/pom.xml
index 4926655..2c3d236 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>17</version>
+    <version>18</version>
     <relativePath><!--Resolve on repository--></relativePath>
   </parent>