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

Merging #909 (67587b7) into main (0baf8d5) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            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              

see 2 files with indirect coverage changes

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