Update ssz to v0.8.12

[wemeetagain]

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Performance Report

✔️ no performance regression detected

Full benchmark results

Benchmark suite	Current: d3fb352	Previous: 0b01245	Ratio
getCommitteeAssignments - req 1000 vs - 250000 vc	11.020 ms/op	8.2903 ms/op	1.33
epoch altair - 250000 vs - 7PWei - processJustificationAndFinalization	308.91 us/op	194.70 us/op	1.59
epoch altair - 250000 vs - 7PWei - processInactivityUpdates	2.5326 s/op	2.1060 s/op	1.20
epoch altair - 250000 vs - 7PWei - processRewardsAndPenalties	1.1570 s/op	908.19 ms/op	1.27
epoch altair - 250000 vs - 7PWei - processRegistryUpdates	16.392 us/op	11.815 us/op	1.39
epoch altair - 250000 vs - 7PWei - processSlashings	117.68 us/op	44.355 us/op	2.65
epoch altair - 250000 vs - 7PWei - processEffectiveBalanceUpdates	135.52 ms/op	47.962 ms/op	2.83
epoch altair - 250000 vs - 7PWei - processParticipationFlagUpdates	328.65 ms/op	266.11 ms/op	1.24
epoch altair - 250000 vs - 7PWei - prepareEpochProcessState	615.40 ms/op	519.31 ms/op	1.19
Process block - 250000 vs - 7PWei - with 0 validator exit	433.14 us/op	622.63 us/op	0.70
Process block - 250000 vs - 7PWei - with 1 validator exit	30.290 ms/op	23.254 ms/op	1.30
Process block - 250000 vs - 7PWei - with 16 validator exits	30.025 ms/op	20.977 ms/op	1.43
epoch phase0 - 250000 vs - 7PWei - processJustificationAndFinalization	213.86 us/op	88.666 us/op	2.41
epoch phase0 - 250000 vs - 7PWei - processRewardsAndPenalties	673.62 ms/op	495.91 ms/op	1.36
epoch phase0 - 250000 vs - 7PWei - processRegistryUpdates	26.049 us/op	16.417 us/op	1.59
epoch phase0 - 250000 vs - 7PWei - processSlashings	81.682 us/op	50.734 us/op	1.61
epoch phase0 - 250000 vs - 7PWei - processFinalUpdates	58.685 ms/op	48.177 ms/op	1.22
epoch phase0 - 250000 vs - 7PWei - prepareEpochProcessState	979.35 ms/op	945.45 ms/op	1.04
getAttestationDeltas - 250000 vs - 7PWei	179.32 ms/op	100.71 ms/op	1.78
processSlots - 250000 vs - 7PWei - 32 empty slots	6.3712 s/op	5.6387 s/op	1.13
shuffle list - 16384 els	2.1210 ms/op	2.7054 ms/op	0.78
shuffle list - 250000 els	29.310 ms/op	38.473 ms/op	0.76
getPubkeys - persistent - req 1000 vs - 250000 vc	19.801 us/op	19.245 us/op	1.03
BLS verify - blst-native	2.2275 ms/op	1.8697 ms/op	1.19
BLS verifyMultipleSignatures 3 - blst-native	4.5847 ms/op	3.8308 ms/op	1.20
BLS verifyMultipleSignatures 8 - blst-native	9.8402 ms/op	8.2366 ms/op	1.19
BLS verifyMultipleSignatures 32 - blst-native	38.608 ms/op	29.822 ms/op	1.29
BLS aggregatePubkeys 32 - blst-native	48.584 us/op	42.080 us/op	1.15
BLS aggregatePubkeys 128 - blst-native	186.70 us/op	155.03 us/op	1.20
getAttestationsForBlock	119.60 ms/op	107.54 ms/op	1.11
validate gossip signedAggregateAndProof - struct	7.3670 ms/op	4.5063 ms/op	1.63
validate gossip signedAggregateAndProof - treeBacked	5.3735 ms/op	4.4536 ms/op	1.21
validate gossip attestation - struct	2.5117 ms/op	2.0927 ms/op	1.20
validate gossip attestation - treeBacked	2.5722 ms/op	2.1294 ms/op	1.21

by benchmarkbot/action