chore: tagRelease.sh: bump to 1.2.4 in 1.2.x branch (#532)

Author: nickboldt

artifacts/attributes.adoc

@@ -11,8 +11,8 @@
 :product-short: Developer Hub
 :product-very-short: RHDH
 :product-version: 1.2
-:product-bundle-version: 1.2.3
-:product-chart-version: 1.2.3
+:product-bundle-version: 1.2.4
+:product-chart-version: 1.2.4
 :product-backstage-version: 1.26.5
 :rhdeveloper-name: Red Hat Developer
 :rhel: Red Hat Enterprise Linux