fix: move loopback-component-explorer to devDependencies

Author: Tom Kirkpatrick

package.json

@@ -42,9 +42,6 @@
     "loopback-context": "^3.1.0",
     "cls-hooked": "^4.1.5"
   },
-  "optionalDependencies": {
-    "loopback-component-explorer": "2.3.0"
-  },
   "devDependencies": {
     "@bubltechnology/customizable-commit-analyzer": "^1.0.2-0",
     "chai": "^4.0.2",
@@ -56,6 +53,7 @@
     "eslint-config-fullcube": "^3.0.0",
     "loopback": "^2.25.0",
     "loopback-boot": "^2.24.0",
+    "loopback-component-explorer": "2.3.0",
     "loopback-context": "^3.1.0",
     "cls-hooked": "^4.1.5",
     "loopback-component-fixtures": "^1.1.0",