runtime: Reduce the size of the light block LRU store

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #5150 (ef9b978) into master (44cdffa) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5150      +/-   ##
==========================================
- Coverage   66.91%   66.83%   -0.08%     
==========================================
  Files         496      496              
  Lines       53275    53275              
==========================================
- Hits        35647    35609      -38     
- Misses      13301    13318      +17     
- Partials     4327     4348      +21     

Impacted Files	Coverage Δ
go/consensus/tendermint/apps/staking/auth.go	62.96% <0.00%> (-14.82%)	⬇️
go/scheduler/api/sanity_check.go	71.42% <0.00%> (-9.53%)	⬇️
go/consensus/p2p/light/server.go	51.61% <0.00%> (-6.46%)	⬇️
go/runtime/host/protocol/connection.go	65.03% <0.00%> (-6.02%)	⬇️
...o/consensus/tendermint/apps/governance/messages.go	60.52% <0.00%> (-5.27%)	⬇️
go/p2p/dispatch.go	72.07% <0.00%> (-5.20%)	⬇️
go/storage/mkvs/lookup.go	75.00% <0.00%> (-4.17%)	⬇️
go/roothash/api/api.go	82.14% <0.00%> (-3.58%)	⬇️
go/worker/common/committee/keymanager.go	88.70% <0.00%> (-3.23%)	⬇️
...nsensus/tendermint/apps/governance/transactions.go	71.09% <0.00%> (-2.37%)	⬇️
... and 30 more

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