Bump docs copyright year

[charlesbluca]

Updates docs copyright year with datetime, based on #615 (comment)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (branch-21.06@83b065e). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 70d5b25 differs from pull request most recent head 0297295. Consider uploading reports for the commit 0297295 to get more accurate results

@@               Coverage Diff               @@
##             branch-21.06     #616   +/-   ##
===============================================
  Coverage                ?   90.71%           
===============================================
  Files                   ?       15           
  Lines                   ?     1616           
  Branches                ?        0           
===============================================
  Hits                    ?     1466           
  Misses                  ?      150           
  Partials                ?        0           

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[jakirkham]

rerun tests

[charlesbluca]

@gpucibot merge