runtime: Stop using the ring backend for snow

[kostko]

See #2683

[codecov]

Codecov Report

Merging #3990 (87502bb) into master (aa25d09) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3990      +/-   ##
==========================================
+ Coverage   67.07%   67.18%   +0.10%     
==========================================
  Files         411      411              
  Lines       42082    42082              
==========================================
+ Hits        28228    28272      +44     
+ Misses       9868     9838      -30     
+ Partials     3986     3972      -14     

Impacted Files	Coverage Δ
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
go/storage/api/root_cache.go	80.00% <0.00%> (-4.45%)	⬇️
go/runtime/host/sandbox/sandbox.go	80.07% <0.00%> (-2.35%)	⬇️
go/runtime/history/history.go	72.04% <0.00%> (-2.16%)	⬇️
go/consensus/tendermint/abci/state.go	70.27% <0.00%> (-2.03%)	⬇️
go/runtime/nodes/versioned.go	73.33% <0.00%> (-1.91%)	⬇️
go/worker/common/p2p/dispatch.go	72.60% <0.00%> (-1.37%)	⬇️
go/storage/mkvs/insert.go	91.78% <0.00%> (-1.37%)	⬇️
go/runtime/client/submitter.go	60.40% <0.00%> (-1.35%)	⬇️
go/registry/api/api.go	53.23% <0.00%> (-1.11%)	⬇️
... and 31 more

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