Updated versions for 1.6

Author: hmanwani-rh

artifacts/attributes.adoc

@@ -10,10 +10,10 @@
 :product: Red Hat Developer Hub
 :product-short: Developer Hub
 :product-very-short: RHDH
-:product-version: 1.5
-:product-bundle-version: 1.5.0
-:product-chart-version: 1.5.0
-:product-backstage-version: 1.35.0
+:product-version: 1.6
+:product-bundle-version: 1.6.0
+:product-chart-version: 1.6.0
+:product-backstage-version: 1.36.0
 :product-custom-resource-type: Backstage
 :rhdeveloper-name: Red Hat Developer
 :rhel: Red Hat Enterprise Linux