ML-DSA fixes: small vfy key object, small SHA-3, fix test #2493

Job	Run time
make check (--enable-sm2 --enable-sm3 --enable-sm4-ecb --enable-sm4-cbc --enable-sm4-ctr --enable...	53s
make check (--enable-all --enable-sm2 --enable-sm3 --enable-sm4-ecb --enable-sm4-cbc --enable-sm4...	3m 2s
make check (--enable-sm2 --enable-sm3 --enable-sm4-gcm --enable-sm4-ccm --enable-sha3)	1m 3s
	4m 58s

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