chore: Lock old closed issues

[mister-ben]

Locks issues that have been closed for 60 days.

Why

People occasionally comment on old, closed issues that they are also having the "same issue". This is rarely useful:

• the comment is less likely to be seen or responded to
• it's probably not the same issue, even if a symptom is similar (like a generic error message)
• the assertion that it's "still happening" is usually not presented with any actionable information, such as steps to reproduce

If someone believes they are having the "same" issue, they should create a new issue with their steps to reproduce and include a link to the closed issue.

Implementation

• Uses Lock Threads action.
• Locks closed issues after 60 days.
• Does not lock PRs.
• Runs once an hour, as the action processes max 50 items at a time. It can be reduced to daily once the backlog is clear.
• Does not comment on the issue, the notifications would be annoying for old issues.

[codecov]

Codecov Report

Merging #7777 (7badbdd) into main (50ffd57) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #7777   +/-   ##
=======================================
  Coverage   80.92%   80.92%           
=======================================
  Files         116      116           
  Lines        7461     7461           
  Branches     1811     1811           
=======================================
  Hits         6038     6038           
  Misses       1423     1423           

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[gkatsev]

I was going to ask if this will fight with stalebot but I guess this only looks at closed issues.