release: bump starknet-accounts to 0.6.1 #993

Job	Run time
no-std build	1m 34s
WASM tests	4m 5s
Windows tests (stable, x86_64-pc-windows-gnu)	14m 59s
Windows tests (stable, x86_64-pc-windows-msvc)	15m 0s
Windows tests (nightly, x86_64-pc-windows-gnu)	12m 48s
Windows tests (nightly, x86_64-pc-windows-msvc)	3m 54s
Unix tests (ubuntu-latest, stable)	2m 0s
Unix tests (ubuntu-latest, nightly)	1m 58s
Unix tests (macos-11, stable)	15m 20s
Unix tests (macos-11, nightly)	15m 19s
	1h 26m 57s

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