Change default LOGOUT method to POST.

[jwag956]

This is considered modern best practice to avoid a user being logged out by simply clicking on a (possibly malware) link.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.63%. Comparing base (2313ab2) to head (777c935).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1235   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files          43       43           
  Lines        5367     5367           
=======================================
  Hits         5294     5294           
  Misses         73       73           

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