fix(protractor): optional Serenity/JS modules are marked as peerDepen…

…dencies to avoid NPM installing them by default

While this change might result in NPM warning the user that there is an "unmet peer dependency"
when installing @serenity-js/protractor or @serenity-js/cucumber modules, it seems like a better
option than the default NPM behaviour of installing all the "optional" dependencies by default,
forcing the user to download more dependencies than they want or need.

More details about the npm issue:
- npm/npm#3066
- https://npm.community/t/npm-install-no-optional-not-actually-filtering-optionals-in-cli-6-0-1-or-6-1-0/257

packages/cucumber/package.json

@@ -50,7 +50,7 @@
     "gherkin": "5.1.0",
     "tiny-types": "^1.16.1"
   },
-  "optionalDependencies": {
+  "peerDependencies": {
     "@cucumber/cucumber": "^7.0.0",
     "cucumber": "^1.3.3 || ^2.3.1 || ^3.2.2 || ^4.2.1 || ^5.0.0 || ^6.0.0"
   },

packages/protractor/package.json

@@ -54,12 +54,10 @@
     "is-plain-object": "^5.0.0",
     "tiny-types": "^1.16.1"
   },
-  "optionalDependencies": {
+  "peerDependencies": {
     "@serenity-js/cucumber": "2.23.1",
     "@serenity-js/jasmine": "2.23.1",
-    "@serenity-js/mocha": "2.23.1"
-  },
-  "peerDependencies": {
+    "@serenity-js/mocha": "2.23.1",
     "protractor": "^5.0.0 || ^7.0.0",
     "selenium-webdriver": "^3.6.0"
   },