Update GitHub action scripts

[odow]

Clarabel has been failing our solver-tests.yml job for a while: https://github.com/jump-dev/MathOptInterface.jl/actions/runs/14371008998/job/40297204676

But you won't have noticed because the CI job tests only v1.10.

Also, CI was running only on PRs, and not on pushes to main: https://github.com/oxfordcontrol/Clarabel.jl/commits/main/

I assume this will cause the v1 tests to fail, so I'll see if I can fix them. Either in this PR or in a new one.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.25%. Comparing base (6d2f198) to head (d9cc3e1).
⚠️ Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   88.86%   88.25%   -0.62%     
==========================================
  Files          59       60       +1     
  Lines        4715     4826     +111     
==========================================
+ Hits         4190     4259      +69     
- Misses        525      567      +42     

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[odow]

Failures are because of a change in the Random.MersenneTwister stream between versions. I'll make a fix in this PR.