build: remove unused development dependencies

Several repository development dependencies listed in the `package.json` are no longer used and have been removed.

Author: clydin

package.json

@@ -139,7 +139,6 @@
     "circular-dependency-plugin": "5.2.2",
     "codelyzer": "^6.0.0",
     "common-tags": "^1.8.0",
-    "conventional-changelog": "^3.0.0",
     "conventional-commits-parser": "^3.0.0",
     "copy-webpack-plugin": "9.0.1",
     "core-js": "3.15.2",
@@ -186,7 +185,6 @@
     "minimist": "^1.2.0",
     "ng-packagr": "~12.1.0-next.0",
     "node-fetch": "^2.2.0",
-    "npm-registry-client": "8.6.0",
     "open": "8.2.1",
     "ora": "5.4.1",
     "pacote": "11.3.4",