Update attributes.adoc for release of 1.6.1 (#1200)

Author: nickboldt

artifacts/attributes.adoc

@@ -13,8 +13,8 @@
 :product-local: Red Hat Developer Hub Local
 :product-local-very-short: RHDH Local
 :product-version: 1.6
-:product-bundle-version: 1.6.0
-:product-chart-version: 1.6.0
+:product-bundle-version: 1.6.1
+:product-chart-version: 1.6.1
 :product-backstage-version: 1.36.1
 :product-version-next: 1.7
 :product-custom-resource-type: Backstage