Prepare for 8.2.0 release

[martincostello]

• Bump Polly version to 8.2.0.
• Update API/NuGet package baselines for 8.1.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61fdcbd) 84.52% compared to head (aba1606) 84.52%.
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1758   +/-   ##
=======================================
  Coverage   84.52%   84.52%           
=======================================
  Files         306      306           
  Lines        6772     6772           
  Branches     1042     1042           
=======================================
  Hits         5724     5724           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	84.52% <ø> (?)
macos	84.52% <ø> (?)
windows	84.52% <ø> (ø)

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