Bump CUDNN and CUTENSOR

[maleadt]

CUDNN v8.0, for CUDA 11 compatibility
CUTENSOR 1.2, now also with Windows artifacts (cc @kshyatt, fixes #301)
Both with PPC artifacts, but we don't have CUDA itself for PPC packaged yet.

[codecov]

Codecov Report

Merging #325 into master will decrease coverage by 0.06%.
The diff coverage is 30.00%.

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
- Coverage   79.36%   79.29%   -0.07%     
==========================================
  Files         155      155              
  Lines        8907     8913       +6     
==========================================
- Hits         7069     7068       -1     
- Misses       1838     1845       +7     

Impacted Files	Coverage Δ
deps/discovery.jl	72.58% <0.00%> (-2.01%)	⬇️
src/initialization.jl	70.96% <50.00%> (ø)
deps/bindeps.jl	85.89% <100.00%> (-1.20%)	⬇️

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