Temporarily pin RMM while refactor removes deprecated calls

[dantegd]

This should unblock build locally and in CI. Needs to be undone after #1707 is merged.

cc @ChuckHastings

[BradReesWork]

rerun tests

[dantegd]

@BradReesWork just realized that the RAFT PR rapidsai/raft#315 needs to be merged first so that this one passes CI

[rlratzel]

Thanks! One minor request if possible, which need not hold up approval.

[rlratzel]

Thanks for updating the conda files too, that should cover everything now.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (branch-21.10@67d2d98). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             branch-21.10    #1775   +/-   ##
===============================================
  Coverage                ?   59.63%           
===============================================
  Files                   ?       77           
  Lines                   ?     3535           
  Branches                ?        0           
===============================================
  Hits                    ?     2108           
  Misses                  ?     1427           
  Partials                ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 67d2d98...6627e4d. Read the comment docs.

[BradReesWork]

@gpucibot merge