Bump to version 7.7.3

composer.json

 {
   "name": "adi-ia/cbs-techstore-client-php",
   "description": "A PHP client used to connect with the CBS API and perform requests",
-  "version": "7.7.2",
+  "version": "7.7.3",
   "license": "Apache-2.0",
   "homepage": "https://wiki.doit.wisc.edu/confluence/display/ADIIA/CBS",
   "authors": [