Upgrade parent pom to version 8.0.4

Upgrade to benefit from CVE-2021-22096 fix in Spring dependency to allow a successful build.

pom.xml

@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.ow2.authzforce</groupId>
 		<artifactId>authzforce-ce-parent</artifactId>
-		<version>8.0.3</version>
+		<version>8.0.4</version>
 	</parent>
 	<artifactId>authzforce-ce-xacml-json-model</artifactId>
 	<packaging>jar</packaging>