deps: pin blake3 to `std` feature instead of `hpc-extras` #299

Job	Run time
nostd/thumbv6m-none-eabi/stable	25s
hpc-stream-parallel/rayon	1m 22s
format/stable	22s
native-backend/stable	7m 52s
Pass MSRV values to other jobs	2s
clippy/1.95.0	47s
docs/nightly	0s
miri	0s
cargo-careful	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	53s
tests/stable	11m 18s
tests/beta	10m 48s
tests/1.95.0	11m 3s
conclusion	0s
	44m 52s

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