Address cert-oop54-cpp & concurrency-mt-unsafe warnings

[yperbasis]

No description provided.

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (d6d3d8a) 52.98% compared to head (65494de) 52.99%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
silkworm/node/etl/file_provider.cpp	0.00%	4 Missing ⚠️
silkworm/core/common/small_map.hpp	0.00%	2 Missing and 1 partial ⚠️
silkworm/core/concurrency/resettable_once_flag.hpp	0.00%	2 Missing and 1 partial ⚠️
silkworm/infra/common/memory_mapped_file.cpp	25.00%	3 Missing ⚠️
silkworm/node/bittorrent/client.cpp	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1759      +/-   ##
==========================================
+ Coverage   52.98%   52.99%   +0.01%     
==========================================
  Files         599      599              
  Lines       44784    44793       +9     
  Branches     6958     6961       +3     
==========================================
+ Hits        23728    23740      +12     
+ Misses      18973    18968       -5     
- Partials     2083     2085       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.