go.mod: update dbft

[roman-khimov]

Import nspcc-dev/dbft#61.

[codecov]

Codecov Report

Merging #2573 (8d08c4a) into master (52fd897) will decrease coverage by 0.00%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #2573      +/-   ##
==========================================
- Coverage   84.91%   84.91%   -0.01%     
==========================================
  Files         296      296              
  Lines       37215    37215              
==========================================
- Hits        31602    31600       -2     
- Misses       4270     4272       +2     
  Partials     1343     1343              

Impacted Files	Coverage Δ
pkg/services/notary/notary.go	83.28% <18.18%> (ø)
pkg/consensus/consensus.go	73.24% <77.77%> (ø)
pkg/network/server.go	74.31% <88.88%> (ø)
pkg/services/stateroot/validators.go	73.46% <100.00%> (ø)
pkg/network/message_string.go	70.96% <0.00%> (-6.46%)	⬇️

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