Artificially increase block time

[herr-seppia]

Increase block time to 15secs
Update rusk state root

[codecov-commenter]

Codecov Report

Merging #1312 (cefc86c) into master (828364b) will decrease coverage by 8.69%.
The diff coverage is n/a.

❗ Current head cefc86c differs from pull request most recent head f109733. Consider uploading reports for the commit f109733 to get more accurate results

@@            Coverage Diff             @@
##           master    #1312      +/-   ##
==========================================
- Coverage   50.51%   41.82%   -8.70%     
==========================================
  Files         145      144       -1     
  Lines        7544     9110    +1566     
==========================================
- Hits         3811     3810       -1     
- Misses       3066     4723    +1657     
+ Partials      667      577      -90     

Impacted Files	Coverage Δ
pkg/core/consensus/testing/node.go	0.00% <0.00%> (-93.55%)	⬇️
...ore/consensus/blockgenerator/candidate/testutil.go	0.00% <0.00%> (-90.91%)	⬇️
pkg/core/consensus/testing/utils.go	0.00% <0.00%> (-75.61%)	⬇️
...core/consensus/blockgenerator/candidate/genesis.go	0.00% <0.00%> (-69.24%)	⬇️
...nsensus/blockgenerator/candidate/blockgenerator.go	0.00% <0.00%> (-64.29%)	⬇️
pkg/gql/query/transactions.go	13.27% <0.00%> (-52.71%)	⬇️
pkg/rpc/client/session.go	21.42% <0.00%> (-47.15%)	⬇️
pkg/util/nativeutils/eventbus/eventbus.go	57.14% <0.00%> (-42.86%)	⬇️
pkg/rpc/client/client.go	3.73% <0.00%> (-36.61%)	⬇️
pkg/core/consensus/reduction/aggregator.go	56.25% <0.00%> (-35.06%)	⬇️
... and 165 more

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