#1839: use unsigned types for left shifts in BitPacker

[nmm0]

fixes #1839

[github-actions]

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[codecov]

Codecov Report

Merging #1840 (f792858) into develop (f792858) will not change coverage.
The diff coverage is n/a.

❗ Current head f792858 differs from pull request most recent head 121aa67. Consider uploading reports for the commit 121aa67 to get more accurate results

@@           Coverage Diff            @@
##           develop    #1840   +/-   ##
========================================
  Coverage    84.32%   84.32%           
========================================
  Files          757      757           
  Lines        26684    26684           
========================================
  Hits         22500    22500           
  Misses        4184     4184           

[nmm0]

I switch to std::memcpy instead of static_cast since that's the correct way of bit casting