Drop python310

[JHolba]

Dropping python 3.10 support

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (309a535) to head (c50a4bd).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9433      +/-   ##
==========================================
+ Coverage   91.85%   91.86%   +0.01%     
==========================================
  Files         433      433              
  Lines       26661    26657       -4     
==========================================
- Hits        24489    24488       -1     
+ Misses       2172     2169       -3     

Flag	Coverage Δ
cli-tests	39.42% <100.00%> (+<0.01%)	⬆️
everest-models-test	34.83% <0.00%> (-0.01%)	⬇️
gui-tests	72.34% <100.00%> (+<0.01%)	⬆️
integration-test	37.14% <0.00%> (+<0.01%)	⬆️
performance-tests	52.18% <100.00%> (+0.11%)	⬆️
test	40.52% <0.00%> (+0.02%)	⬆️
unit-tests	74.02% <100.00%> (-0.01%)	⬇️

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[andreas-el]

Seeing that we already pinned ert for py38, this seems like a natural next step.
Assuming you got clearance for this, ✅