Update rapids-cmake to 21.12

[dantegd]

Required to merge rapidsai/raft#370

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (branch-21.12@3840ef6). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head a11cad4 differs from pull request most recent head f6a06e6. Consider uploading reports for the commit f6a06e6 to get more accurate results

@@               Coverage Diff               @@
##             branch-21.12    #1931   +/-   ##
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  Coverage                ?   70.04%           
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  Files                   ?      143           
  Lines                   ?     8904           
  Branches                ?        0           
===============================================
  Hits                    ?     6237           
  Misses                  ?     2667           
  Partials                ?        0           

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[BradReesWork]

rerun tests

[ChuckHastings]

@gpucibot merge