Use released Oslo/Potassium parent poms

Use released version of parent poms for ONAP Oslo release

Issue-ID: CCSDK-3990
Signed-off-by: Dan Timoney <dtimoney@att.com>
Change-Id: If431c6787988784812b592fa4b67935955b05aaf
diff --git a/pom.xml b/pom.xml
index b31a15f..d63614c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.onap.ccsdk.parent</groupId>
         <artifactId>spring-boot-27-starter-parent</artifactId>
-        <version>2.8.0-SNAPSHOT</version>
+        <version>2.8.0</version>
         <relativePath/>
     </parent>