fix: update actions/checkout action to v3

[renovate[bot]]

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

• Use @​actions/core saveState and getState
• Add github-server-url input

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[codecov[bot]]

Codecov Report

Merging #118 (70f510f) into master (9fca52a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   86.11%   86.11%           
=======================================
  Files           2        2           
  Lines          36       36           
=======================================
  Hits           31       31           
  Misses          5        5           

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