macos-latest CI float=ON failing since April 23

[traversaro]

Error:

4/5 Test #4: MPCUnitTests .....................***Failed    2.02 sec
[     cout ] Avarage time = 0.0401199 seconds.


MPCUnitTests is a Catch v2.13.9 host application.
Run with -? for options

-------------------------------------------------------------------------------
MPCTest
-------------------------------------------------------------------------------
/Users/runner/work/osqp-eigen/osqp-eigen/tests/MPCTest.cpp:222
...............................................................................

/Users/runner/work/osqp-eigen/osqp-eigen/tests/MPCTest.cpp:337: FAILED:
  REQUIRE( getErrorNorm(x0, xRef) <= tolerance )
with expansion:
  0.2192f <= 0.01

===============================================================================
test cases:   1 |   0 passed | 1 failed
assertions: 107 | 106 passed | 1 failed


    Start 5: MPCUpdateMatricesUnitTests
5/5 Test #5: MPCUpdateMatricesUnitTests .......   Passed    0.03 sec

80% tests passed, 1 tests failed out of 5

Total Test time (real) =   2.08 sec

The following tests FAILED:
Errors while running CTest
	  4 - MPCUnitTests (Failed)
Error: Process completed with exit code 8.

First failing: https://github.com/robotology/osqp-eigen/actions/runs/8809948035/job/24181528543
Last successful: https://github.com/robotology/osqp-eigen/actions/runs/8793748649/job/24132087644

The first failing is using macos-14-arm64 as image, while the last successful macos-12, so this is probably an effect of the migration to Apple Silicon.

As in general we moved from brew to conda-forge deps on macos, I suggest to migrate the CI to conda-forge and see if the problem persists.