Update uwebsocket to 20.32.0 #639

Job	Run time
Forge Node LTS Matrix	1s
Documentation - Error codes check	1m 18s
Lint - Node.js LTS 16	1m 19s
Lint - Node.js LTS 18	1m 21s
Unit Tests (16)	2m 0s
Unit Tests (18)	2m 22s
Functional Tests - jest - Node.js v16	3m 14s
Build and Run kuzzle	4m 19s
Functional Tests - jest - Node.js v18	4m 29s
Build and Run kuzzle	3m 39s
Functional Tests - http - Node.js v16	7m 31s
Functional Tests - http - Node.js v18	8m 40s
Functional Tests - websocket - Node.js v16	7m 39s
Functional Tests - websocket - Node.js v18	7m 25s
Functional Tests - legacy:mqtt - Node.js v16	7m 46s
Functional Tests - legacy:mqtt - Node.js v18	7m 51s
Functional Tests - legacy:http - Node.js v16	7m 49s
Functional Tests - legacy:http - Node.js v18	7m 4s
Functional Tests - legacy:websocket - Node.js v16	7m 53s
Functional Tests - legacy:websocket - Node.js v18	8m 23s
Cluster Monkey Tests (16)	3m 33s
Cluster Monkey Tests (18)	3m 44s
Deployment Workflow / Build and deploy release on NPM.js	0s
Deployment Workflow / Build and deploy images to Dockerhub	0s
Deployment Workflow / Documentation - Deploy	0s
	1h 49m 20s

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