uri_signing plugin: Fix missing payload validation for the iss field (#8901)#8912

ezelkow1 merged 1 commit intoapache:8.1.xapache/trafficserver:8.1.xfrom

dsouza93:8.1.x-uri-iss-fixdsouza93/trafficserver:8.1.x-uri-iss-fixCopy head branch name to clipboard