Add python3.11 for the build and testing

[juarezr]

This PR has the objective of

Changes

1. Added python3.11 to the tox configuration
2. Added a new job in the github actions for testing petL with python3.11

Checklist

Use this checklist to ensure the quality of pull requests that include new code and/or make changes to existing code.

• Source Code rules apply:
  • Includes unit tests
  • New functions have docstrings with examples that can be run with doctest
  • New functions are included in API docs
  • Docstrings include notes for any changes to API or behavior
  • All changes are documented in docs/changes.rst
• Versioning and history tracking rules apply:
  • Using atomic commits when possible
  • Commits are reversible when possible
  • There are no incomplete changes in the pull request
  • There is no accidental garbage added to the source code
• Testing rules apply:
  • Tested locally using tox / pytest
  • Automated testing passes (see CI)
  • Unit test coverage has not decreased (see Coveralls)
• State of these changes is:
  • Just a proof of concept
  • Work in progress / Further changes needed
  • Ready to review
  • Ready to merge

[coveralls]

Pull Request Test Coverage Report for Build 3528318614

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.117%

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Totals
Change from base Build 3131975355:	0.0%
Covered Lines:	12750
Relevant Lines:	13993

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💛 - Coveralls