go/registry: Change minimum ProposerTimeout from 5 to 2 blocks

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #3682 (7d57ffd) into master (8187e2c) will increase coverage by 0.25%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3682      +/-   ##
==========================================
+ Coverage   66.67%   66.92%   +0.25%     
==========================================
  Files         393      393              
  Lines       38370    38373       +3     
==========================================
+ Hits        25582    25681      +99     
+ Misses       9107     9034      -73     
+ Partials     3681     3658      -23     

Impacted Files	Coverage Δ
go/oasis-node/cmd/registry/runtime/runtime.go	58.55% <0.00%> (-0.59%)	⬇️
go/registry/api/runtime.go	45.85% <0.00%> (ø)
go/worker/storage/service_external.go	40.74% <0.00%> (-7.41%)	⬇️
go/consensus/tendermint/apps/beacon/genesis.go	62.50% <0.00%> (-6.25%)	⬇️
go/storage/api/metrics.go	86.15% <0.00%> (-4.62%)	⬇️
go/storage/mkvs/prefetch.go	54.71% <0.00%> (-3.78%)	⬇️
go/consensus/tendermint/abci/state.go	71.83% <0.00%> (-1.77%)	⬇️
go/keymanager/client/client.go	81.57% <0.00%> (-1.76%)	⬇️
go/runtime/nodes/grpc/grpc.go	72.69% <0.00%> (-1.61%)	⬇️
go/runtime/client/watcher.go	62.96% <0.00%> (-1.49%)	⬇️
... and 31 more

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