Update to current CM3 versions of CMEPS and CICE

[blimlim]

This PR updates the CMEPs and CICE submodules on the cm3 branch to the latest CM3-specific versions:

• CICE updated to b8850f7
• CMEPS updated to d80e784

These updates are temporary, and each component will shortly be updated to the versions from #250

[MartinDix]

Checks suggest that Configure Cmake crashed with an illegal instruction which is impressively broken. Is this expected to work?

[blimlim]

Error happens when using the current cm3 branch with no changes: #271

The changes here update the submodules to the versions that are picked up when following the dev-coupling build instructions, which work when building locally.

Most of the CMake files in the main branch have changed since the cm3 branch split off. I wonder if these differences are why the CI is failing? When updating to the latest versions, the CMake files will also be updated.

[kieranricardo]

Looks good, very strange CI failures though! @blimlim I think you're right, and we worry about them once everything is updated. Probably the way om3 is built has changed quite a bit since these branches diverged.