📖 Update contributor ladder to reduce duration requirements

[afmarcum]

What kind of change does this PR introduce?

Documentation/process change

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

Triager must be a community member for 3 months
Maintainer must be a traiger for 3 months

What is the new behavior (if this is a feature change)?**

Triager must be a community member for 1 month
Maintainer must be a traiger for 1 month

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

NONE
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Special notes for your reviewer

Does this PR introduce a user-facing change?

[codecov]

Codecov Report

Merging #3899 (a1d60aa) into main (299948e) will decrease coverage by 4.64%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3899      +/-   ##
==========================================
- Coverage   75.36%   70.72%   -4.64%     
==========================================
  Files         232      232              
  Lines       15682    15682              
==========================================
- Hits        11818    11091     -727     
- Misses       3129     3903     +774     
+ Partials      735      688      -47     

[spencerschrock]

We have previously discussed this change in the maintainer sync. The primary distinction being "at least" 1 month. So long as knowledge about the codebase is exhibited, the timeline is less important.

[justaugustus]

Thanks for the update, @afmarcum!