Update rebar3_codecov to use the latest hex package

[NelsonVides]

Very quick update to use the hex package, now that it has been updated :)

[codecov]

Codecov Report

Merging #3077 (343f3fd) into master (8b30cbb) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3077      +/-   ##
==========================================
+ Coverage   78.77%   78.78%   +0.01%     
==========================================
  Files         379      379              
  Lines       31137    31137              
==========================================
+ Hits        24527    24532       +5     
+ Misses       6610     6605       -5     

Impacted Files	Coverage Δ
src/mongoose_tcp_listener.erl	76.59% <0.00%> (-4.26%)	⬇️
src/cassandra/mongoose_cassandra_worker.erl	70.75% <0.00%> (-0.48%)	⬇️
src/mod_roster.erl	76.56% <0.00%> (-0.24%)	⬇️
src/pubsub/mod_pubsub.erl	71.92% <0.00%> (+0.05%)	⬆️
src/ejabberd_s2s_out.erl	59.72% <0.00%> (+1.83%)	⬆️

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[leszke]

🔥