docs(uuid): update RFC references

[kt3k]

Some docs in std/uuid still link to the older rfc (4122). This PR updates them to the latest one (9562).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.97%. Comparing base (360851f) to head (472b4d3).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6437      +/-   ##
==========================================
- Coverage   96.03%   95.97%   -0.07%     
==========================================
  Files         562      564       +2     
  Lines       42418    42482      +64     
  Branches     6387     6395       +8     
==========================================
+ Hits        40738    40772      +34     
- Misses       1641     1670      +29     
- Partials       39       40       +1     

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