Update actions/checkout action to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3

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Release Notes

actions/checkout

v3

Compare Source

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Configuration

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[codecov]

Codecov Report

Merging #200 (ebb8e7e) into main (69fedff) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #200   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files          19       19           
  Lines         574      574           
=======================================
  Hits          568      568           
  Misses          6        6           

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