Use python 3.10 on run-ert-test-data for macOS

[andreas-el]

Relates to #update gui tests

Use python version 3.10 for macOS.

Pre review checklist

• Read through the code changes carefully after finishing work
• Make sure tests pass locally (after every commit!)
• Prepare changes in small commits for more convenient review (optional)
• PR title captures the intent of the changes, and is fitting for release notes.
• Updated documentation
• Ensured that unit tests are added for all new behavior (See
  Ground Rules),
  and changes to existing code have good test coverage.

Pre merge checklist

• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.

[codecov-commenter]

Codecov Report

Merging #6126 (a2f5f67) into main (7b6b10b) will increase coverage by 0.01%.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6126      +/-   ##
==========================================
+ Coverage   82.42%   82.44%   +0.01%     
==========================================
  Files         350      350              
  Lines       21449    21450       +1     
  Branches      834      839       +5     
==========================================
+ Hits        17680    17684       +4     
+ Misses       3471     3468       -3     
  Partials      298      298              

see 8 files with indirect coverage changes

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