GHSA-2vrf-hf26-jrp5: angular vulnerable to regular expression denial of service via the angular.copy() utility

All versions of the package angular are vulnerable to Regular Expression Denial of Service (ReDoS) via the angular.copy() utility function due to the usage of an insecure regular expression. Exploiting this vulnerability is possible by a large carefully-crafted input, which can result in catastrophic backtracking.