Close inactive issues in 30 days

[danielduan]

Issue: Too many support requests stay open in GitHub

What I did

Close tickets after 30 days instead of 60

Contributors: please add a status tag such as todo or in progress if an issue should be worked on or is in progress to disable automatic closing.

[codecov]

Codecov Report

Merging #3273 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3273   +/-   ##
=======================================
  Coverage   36.21%   36.21%           
=======================================
  Files         443      443           
  Lines        9737     9737           
  Branches      901      918   +17     
=======================================
  Hits         3526     3526           
- Misses       5633     5635    +2     
+ Partials      578      576    -2

Impacted Files	Coverage Δ
app/polymer/src/server/utils.js	0% <0%> (-100%)	⬇️
addons/storyshots/src/react/renderShallowTree.js	57.14% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
.../viewport/src/manager/components/SelectViewport.js	18.18% <0%> (ø)	⬆️
.../viewport/src/manager/components/RotateViewport.js	22.72% <0%> (ø)	⬆️
...res__/update-addon-info/update-addon-info.input.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Button.js	11.9% <0%> (ø)	⬆️
addons/jest/src/components/Result.js	0% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/pre/pre.js	77.58% <0%> (ø)	⬆️
... and 56 more

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