release: bump starknet-crypto to 0.7.3 #1450

Job	Run time
no-std build	45s
Unix tests (ubuntu-latest, stable)	2m 41s
WASM tests	4m 1s
Unix tests (ubuntu-latest, nightly)	1m 57s
Unix tests (macos-13, stable)	3m 31s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 46s
Unix tests (macos-13, nightly)	4m 1s
Windows tests (stable, x86_64-pc-windows-msvc)	5m 36s
Unix tests (macos-14, stable)	1m 44s
Windows tests (nightly, x86_64-pc-windows-gnu)	5m 44s
Unix tests (macos-14, nightly)	2m 9s
Windows tests (nightly, x86_64-pc-windows-msvc)	5m 7s
	42m 2s

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