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 1.4.1 to 1.15.2
Updates `@microsoft/sp-webpart-workbench` from 1.4.1 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
...
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