Move implementation to Glassfish coordinates

This is where the combined JAR was being published.

Signed-off-by: Mark Thomas <markt@apache.org>
diff --git a/impl/pom.xml b/impl/pom.xml
index 6a56f9e..1f68ab0 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -29,8 +29,8 @@
         <relativePath/>
     </parent>
     
-    <groupId>com.sun.el</groupId>
-    <artifactId>el-ri</artifactId>
+    <groupId>org.glassfish</groupId>
+    <artifactId>jakarta.el</artifactId>
     <version>4.0.0-SNAPSHOT</version>
 
     <name>Jakarta Expression Language 4.0 Implementation</name>