Add missing property definition

Signed-off-by: Mark Thomas <markt@apache.org>
diff --git a/impl/pom.xml b/impl/pom.xml
index 70993b5..dd5777d 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -82,6 +82,7 @@
         <spec.version>4.0</spec.version>
         <extensionName>jakarta.el.impl</extensionName>
         <bundle.symbolicName>org.glassfish.jakarta.el</bundle.symbolicName>
+        <vendorName>Eclipse Foundation</vendorName>
         <findbugs.version>2.5.2</findbugs.version>
         <findbugs.exclude>${project.basedir}/exclude.xml</findbugs.exclude>
         <findbugs.threshold>High</findbugs.threshold>