chore: bump hardhat version to `2.22.6` #9631

Job	Run time
build-nargo	2m 43s
build-acvm-js	1m 23s
build-noirc-abi	1m 43s
build-noir-wasm	3m 52s
ACVM JS (Node.js)	33s
ACVM JS (Browser)	1m 13s
noirc_abi	1m 34s
Check external repo - AztecProtocol/aztec-nr	9s
noir_codegen	59s
Check external repo - AztecProtocol/aztec-packages	14s
Noir JS	1m 18s
Example scripts	11s
Check external repo - zac-williamson/noir-edwards	5s
Integration Tests (Browser)	1m 50s
noir_wasm	1m 45s
Integration Tests (Node)	2m 23s
End	1s
	21m 56s

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