cluster: fix lint

[dB2510]

Fixes golangci-lint on main.

category: fixbuild
ticket: none

[codecov]

Codecov Report

Base: 52.91% // Head: 53.21% // Increases project coverage by +0.30% 🎉

Coverage data is based on head (c93297b) compared to base (328cb6e).
Patch coverage: 16.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1228      +/-   ##
==========================================
+ Coverage   52.91%   53.21%   +0.30%     
==========================================
  Files         136      136              
  Lines       15987    15987              
==========================================
+ Hits         8460     8508      +48     
+ Misses       6283     6235      -48     
  Partials     1244     1244              

Impacted Files	Coverage Δ
cluster/definition.go	59.10% <16.66%> (ø)
app/vmock.go	71.89% <0.00%> (ø)
core/leadercast/transport.go	76.33% <0.00%> (+1.18%)	⬆️
core/qbft/qbft.go	81.54% <0.00%> (+9.87%)	⬆️

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