rust: bump snow from 0.6.2 to 0.7.1

[ptrus]

Part of: #3245

[codecov]

Codecov Report

Merging #3296 into master will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3296      +/-   ##
==========================================
- Coverage   65.46%   65.28%   -0.18%     
==========================================
  Files         371      371              
  Lines       33016    33016              
==========================================
- Hits        21614    21555      -59     
- Misses       8223     8287      +64     
+ Partials     3179     3174       -5     

Impacted Files	Coverage Δ
go/worker/compute/executor/committee/state.go	71.42% <0.00%> (-14.29%)	⬇️
go/runtime/host/sandbox/sandbox.go	64.96% <0.00%> (-11.42%)	⬇️
go/storage/mkvs/checkpoint/restorer.go	82.00% <0.00%> (-10.00%)	⬇️
...ensus/tendermint/apps/staking/proposing_rewards.go	82.85% <0.00%> (-5.72%)	⬇️
go/worker/common/committee/runtime_host.go	62.88% <0.00%> (-5.16%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	76.42% <0.00%> (-4.57%)	⬇️
go/worker/storage/service_external.go	48.14% <0.00%> (-3.71%)	⬇️
go/runtime/host/protocol/connection.go	56.37% <0.00%> (-2.47%)	⬇️
go/worker/compute/executor/committee/node.go	60.90% <0.00%> (-2.39%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	50.80% <0.00%> (-1.62%)	⬇️
... and 17 more

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