Fix: Bumping core to v6.60.3 automatically via 'frameworkpullrequest' Github action (#3635)

Co-authored-by: oliverfoster <oliverfoster@users.noreply.github.com>

Author: oliverfoster

.gitmodules

@@ -2,4 +2,4 @@
   path = src/core
   branch = master
   url = https://github.com/adaptlearning/adapt-contrib-core
-  installBranch = v6.60.2
+  installBranch = v6.60.3