Close stale issue automatically

[Yang-33]

This will automatically close old issues and pull requests. It should be fine to close those that have not received any responses.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (54ac9ca) 78.93% compared to head (2db2c33) 78.93%.
Report is 6 commits behind head on master.

❗ Current head 2db2c33 differs from pull request most recent head f6add6d. Consider uploading reports for the commit f6add6d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #367   +/-   ##
=======================================
  Coverage   78.93%   78.93%           
=======================================
  Files          40       40           
  Lines        3712     3712           
=======================================
  Hits         2930     2930           
  Misses        590      590           
  Partials      192      192           

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