Bump https-proxy-agent from 2.2.1 to 2.2.3

Bumps [https-proxy-agent](https://github.com/TooTallNate/node-https-proxy-agent) from 2.2.1 to 2.2.3.
- [Release notes](https://github.com/TooTallNate/node-https-proxy-agent/releases)
- [Commits](TooTallNate/proxy-agents@2.2.1...2.2.3)

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

package.json

@@ -79,7 +79,7 @@
     "@types/node": "^12.0.8",
     "angular-cli-ghpages": "^0.5.3",
     "codelyzer": "^5.1.0",
-    "https-proxy-agent": "^2.2.1",
+    "https-proxy-agent": "^2.2.3",
     "jasmine-core": "^3.4.0",
     "jasmine-spec-reporter": "~4.2.1",
     "karma": "^4.1.0",