Bump urijs from 1.19.5 to 1.19.6 in /addon

Bumps [urijs](https://github.com/medialize/URI.js) from 1.19.5 to 1.19.6.
- [Release notes](https://github.com/medialize/URI.js/releases)
- [Changelog](https://github.com/medialize/URI.js/blob/gh-pages/CHANGELOG.md)
- [Commits](https://github.com/medialize/URI.js/compare/v1.19.5...v1.19.6)

Signed-off-by: dependabot[bot] <support@github.com>

addon/package-lock.json

@@ -2597,9 +2597,9 @@
       }
     },
     "urijs": {
-      "version": "1.19.5",
-      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.5.tgz",
-      "integrity": "sha512-48z9VGWwdCV5KfizHsE05DWS5fhK6gFlx5MjO7xu0Krc5FGPWzjlXEVV0nPMrdVuP7xmMHiPZ2HoYZwKOFTZOg=="
+      "version": "1.19.6",
+      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.6.tgz",
+      "integrity": "sha512-eSXsXZ2jLvGWeLYlQA3Gh36BcjF+0amo92+wHPyN1mdR8Nxf75fuEuYTd9c0a+m/vhCjRK0ESlE9YNLW+E1VEw=="
     },
     "user-agents": {
       "version": "1.0.559",