Update Swift version to 6.2 in README

[fpseverino]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.90%. Comparing base (ebd3ee6) to head (3ed0f61).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
- Coverage   71.03%   70.90%   -0.14%     
==========================================
  Files          29       29              
  Lines         877      873       -4     
==========================================
- Hits          623      619       -4     
  Misses        254      254              

see 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gwynne]

A few nits about stuff that isn't even your changes anyway, I just figure might as well while we're here. 🤣