CI PR #1: Fix GitHub CI and 'tox' for local CI on Ubuntu 24.04

[bernhardkaindl]

Topic: Fix GitHub CI

• GitHub dropped support for EOL Python versions in GitHub CI

Contents:

• It has become impractical to use EOL versions like Python 2.7 & 3.6 in CI
• It has become counterproductive (hurts pyright) to use pyre CI, disable it for now.
• Move forward to run the unit tests with Python 3.11

A follow-up PR has been created that includes this commit and compensates for the minimal loss in code coverage:

• CI PR #2: Fix GitHub CI and add checks to compensate for code coverage #144

Note:
If you have review comments, I'd like to apply them using the last PR in this series!

[coveralls]

Pull Request Test Coverage Report for Build 11857456745

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 14 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.5%) to 83.184%

---

Files with Coverage Reduction	New Missed Lines	%
xcp/accessor.py	1	89.1%
xcp/pci.py	2	85.39%
xcp/xmlunwrap.py	2	92.31%
xcp/cpiofile.py	3	75.26%
xcp/compat.py	6	78.57%

Totals
Change from base Build 9109272969:	-0.5%
Covered Lines:	2790
Relevant Lines:	3354

---

💛 - Coveralls