[RELEASE] Release opentelemetry-cpp version 1.16.1

[marcalff]

Fixes #3006

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.66%. Comparing base (497eaf4) to head (1f0f3ba).
Report is 102 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3007      +/-   ##
==========================================
+ Coverage   87.12%   87.66%   +0.55%     
==========================================
  Files         200      190      -10     
  Lines        6109     5858     -251     
==========================================
- Hits         5322     5135     -187     
+ Misses        787      723      -64     

see 121 files with indirect coverage changes

[ThomsonTan]

Thanks, LGTM.