chore(release): aws-lambda-java-runtime-interface-client 2.12.1

[github-actions]

Post-release version bump for aws-lambda-java-runtime-interface-client 2.12.1 (already on Maven Central, tag aws-lambda-java-runtime-interface-client-2.12.1 pushed).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.79%. Comparing base (82856fa) to head (101324b).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #647   +/-   ##
=========================================
  Coverage     66.79%   66.79%           
  Complexity      223      223           
=========================================
  Files            35       35           
  Lines          1018     1018           
  Branches        146      146           
=========================================
  Hits            680      680           
  Misses          286      286           
  Partials         52       52           

Flag	Coverage Δ
aarch64	66.79% <ø> (ø)
x86_64	66.40% <ø> (ø)

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