chore: update version to 2.2.0 in package.json #1289

Job	Run time
setup	1m 17s
test NodeConnection.int.js	5m 32s
test BesuService.int.js	6m 24s
test GethService.int.js	7m 36s
test ErigonService.int.js	6m 26s
test NethermindService.int.js	6m 21s
test FlashbotsMevBoostService.int.js	5m 43s
test PrysmBeaconService.int.js	9m 22s
test LighthouseBeaconService.int.js	11m 20s
test TekuBeaconService.int.js	11m 5s
test LodestarBeaconService.int.js	11m 22s
test NimbusBeaconService.int.js	8m 51s
	1h 31m 19s

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