Increment OS & OSD version to 2.8.0 (#133)

Signed-off-by: Rishabh Singh <[email protected]>

Author: rishabh6788

inventories/opensearch/group_vars/all/all.yml

@@ -7,11 +7,11 @@ os_download_url: https://artifacts.opensearch.org/releases/bundle/opensearch
 
 # opensearch version
 # 2.x Latest Version
-os_version: "2.7.0"
+os_version: "2.8.0"
 
 # opensearch dashboards version
 # 2.x Latest Version
-os_dashboards_version: "2.7.0"
+os_dashboards_version: "2.8.0"
 
 # Configure hostnames for opensearch nodes
 # It is required to configure SSL