fix(logging): make different version logging less obtrusive

[jansegre]

Motivation

Different version log is unnecessarily a warning.

Acceptance Criteria

• Change from log.warn to log.debug.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.98%. Comparing base (a77deb3) to head (eb74c11).

Files	Patch %	Lines
hathor/p2p/states/hello.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1087      +/-   ##
==========================================
+ Coverage   84.90%   84.98%   +0.08%     
==========================================
  Files         310      310              
  Lines       23493    23495       +2     
  Branches     3549     3549              
==========================================
+ Hits        19947    19968      +21     
+ Misses       2838     2824      -14     
+ Partials      708      703       -5     

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