CI: upgrade to CUDA 11.6 on power9

[rbberger]

PR Summary

The CI pipeline was still loading the CUDA 11.4 module.

PR Checklist

• [ ] Code is formatted. (You can use the format_spiner make target.)
• [ ] Adds a test for any bugs fixed. Adds tests for new features.
• [ ] If preparing for a new release, update the version in cmake.

[rbberger]

@ktsai7 @Yurlungur passes re-git

[ktsai7]

While we are at this, could you update the power9 partition name to power9-rhel7 in the file?

.power9: &power9
    SCHEDULER_PARAMETERS: "--nodes=1 --partition=power9"

@rbberger @Yurlungur the power9 partition only has 2 nodes left, which will hang the job quite often so we need to switch to the power9-rhel7

[rbberger]

@Yurlungur feel free to take this one over while I'm on leave.

[Yurlungur]

@Yurlungur feel free to take this one over while I'm on leave.

Will do

While we are at this, could you update the power9 partition name to power9-rhel7 in the file?

Yep I'll make that change. And then if you're happy with it, @ktsai7 , I'll merge after tests pass.

[Yurlungur]

Oh wait, I see you already did it. Thanks, @ktsai7 . I'll run the tests on Darwin and then merge if they pass. (And if you click approve. :) )