Add Python 3.11 to CI, tox, trove classifers, and README

[joshuadavidthomas]

Description

Adds Python 3.11 to the GHA test workflows, tox, trove classifers, and the README.

Related Issue

N/A

Motivation and Context

Python 3.11 was released this week.

How Has This Been Tested?

In CI on my fork.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #1053 (f75cc46) into master (cca3b79) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1053   +/-   ##
=======================================
  Coverage   97.23%   97.23%           
=======================================
  Files          23       23           
  Lines        1231     1231           
  Branches      194      199    +5     
=======================================
  Hits         1197     1197           
  Misses         16       16           
  Partials       18       18           

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[hramezani]

LGTM