chore!: bump msrv to 1.73.0 #4159

Job	Run time
build-nargo	5m 56s
build-noirc-abi	2m 28s
build-acvm-js	2m 29s
build-noir-wasm	3m 49s
noir-js-backend-barretenberg	48s
noirc_abi	41s
ACVM JS (Browser)	1m 7s
ACVM JS (Node.js)	35s
noir_wasm	1m 2s
noir_codegen	57s
Integration Tests (Node)	5m 24s
Integration Tests (Browser)	5m 3s
Noir JS	1m 46s
End	1s
	32m 6s

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