Add explicit support for Python 3.11

[Ousret]

From Python 3.11 CHANGES.

• The Unicode database has been updated to version 14.0.0. (bpo-45190).

[codecov-commenter]

Codecov Report

Merging #164 (430fa34) into master (0cc1528) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #164   +/-   ##
=======================================
  Coverage   89.41%   89.41%           
=======================================
  Files          11       11           
  Lines        1200     1200           
=======================================
  Hits         1073     1073           
  Misses        127      127           

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