Bump socket.io-parser, @microsoft/sp-build-web and @microsoft/sp-webpart-workbench

Removes [socket.io-parser](https://github.com/socketio/socket.io-parser). It's no longer used after updating ancestor dependencies [socket.io-parser](https://github.com/socketio/socket.io-parser), [@microsoft/sp-build-web](http://aka.ms/spfx) and [@microsoft/sp-webpart-workbench](http://aka.ms/spfx). These dependencies need to be updated together.


Removes `socket.io-parser`

Updates `@microsoft/sp-build-web` from 1.1.0 to 1.15.2

Updates `@microsoft/sp-webpart-workbench` from 1.1.0 to 1.12.1

---
updated-dependencies:
- dependency-name: socket.io-parser
  dependency-type: indirect
- dependency-name: "@microsoft/sp-build-web"
  dependency-type: direct:development
- dependency-name: "@microsoft/sp-webpart-workbench"
  dependency-type: direct:development
...

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

samples/react-provision-assets/package.json

@@ -18,9 +18,9 @@
     "@types/react-addons-test-utils": "0.14.15"
   },
   "devDependencies": {
-    "@microsoft/sp-build-web": "~1.1.0",
+    "@microsoft/sp-build-web": "~1.15.2",
     "@microsoft/sp-module-interfaces": "~1.1.0",
-    "@microsoft/sp-webpart-workbench": "~1.1.0",
+    "@microsoft/sp-webpart-workbench": "~1.12.1",
     "gulp": "~3.9.1",
     "@types/chai": ">=3.4.34 <3.6.0",
     "@types/mocha": ">=2.2.33 <2.6.0"