Increase daysUntilStale in stale workflow

[umaannamalai]

This PR increases the time period until which an issue opened in the repo gets automatically marked as stale.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ YAML	prettier	1	0	0	0.5s
✅ YAML	v8r	1		0	1.99s
✅ YAML	yamllint	1		0	0.22s

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.44%. Comparing base (0baf8d5) to head (67587b7).
⚠️ Report is 1266 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #909      +/-   ##
==========================================
- Coverage   81.44%   81.44%   -0.01%     
==========================================
  Files         186      186              
  Lines       18700    18700              
  Branches     3278     3278              
==========================================
- Hits        15231    15230       -1     
- Misses       2535     2536       +1     
  Partials      934      934              

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