Fix rocprim version to 6.1.1

[StewMH]

Required for #901 and fixes the compilation error seen there:

  324 |     if(stream == default_stream || stream == hipStreamPerThread || stream == hipStreamLegacy)

After investigation I opened a rocThrust bug (ROCm/rocThrust#527) - we are picking up the tip of the develop branch for rocprim (a rocThrust dependency), which is no longer compatible with rocm-6.1.1. Fix this in the patch.

Additionally, so this can be tested, start building rocThrust and related test code in HIP Alpaka flavour.

[StewMH]

cc @CrossR

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stephenswat]

LGTM; the fact that RocThrust depends on a develop branch is pretty worrying!

[stephenswat]

By the way, your git client is still not set up correctly; the user is set to Stewart Martin-Haugh stewart.martin-haugh@stfc.ac.uk <smh@cern.ch> rather than either Stewart Martin-Haugh <smh@cern.ch> or Stewart Martin-Haugh <stewart.martin-haugh@stfc.ac.uk>. Doesn't affect your ability to make PRs but it does affect GitHub's ability to credit you for them.