docs: update OSV scanner reusable workflow references to v2.3.1

[catatsuy]

This PR updates docs/github-action.md to use OSV-Scanner Action v2.3.1 everywhere.
The document previously mixed old and new versions; now it is consistent.

[cuixq]

thanks!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.86%. Comparing base (1567d9a) to head (354b949).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2437   +/-   ##
=======================================
  Coverage   67.86%   67.86%           
=======================================
  Files         172      172           
  Lines       13290    13290           
=======================================
  Hits         9019     9019           
  Misses       3567     3567           
  Partials      704      704           

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[catatsuy]

Thank you!