update rebar3 to 3.5.0, hopefully fixes #1699

[bartekgorny]

No description provided.

[codecov-io]

Codecov Report

Merging #1786 into master will increase coverage by 2.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1786      +/-   ##
==========================================
+ Coverage   72.25%   74.42%   +2.16%     
==========================================
  Files         290      290              
  Lines       26931    26931              
==========================================
+ Hits        19460    20044     +584     
+ Misses       7471     6887     -584

Impacted Files	Coverage Δ
src/mod_mam_odbc_prefs.erl	95.6% <0%> (-3.3%)	⬇️
src/rdbms/mongoose_rdbms.erl	69.78% <0%> (-2.88%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	84.44% <0%> (-2.23%)	⬇️
src/ejabberd_c2s.erl	84.19% <0%> (-0.3%)	⬇️
src/mod_muc_log.erl	77.69% <0%> (ø)	⬆️
src/mod_muc.erl	72.89% <0%> (+0.27%)	⬆️
src/ejabberd_config.erl	63.99% <0%> (+0.43%)	⬆️
src/mod_mam_utils.erl	87.41% <0%> (+2.38%)	⬆️
src/mod_mam_muc_odbc_async_pool_writer.erl	73.98% <0%> (+3.25%)	⬆️
src/mod_push_service_mongoosepush.erl	94.11% <0%> (+5.88%)	⬆️
... and 15 more

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