Remove usage of buffers (#81)

[dlfivefifty]

This tracks changes in Julia-1.7 and fixes #81

[codecov]

Codecov Report

Merging #85 (f750a17) into master (9bf880c) will increase coverage by 0.43%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   85.00%   85.43%   +0.43%     
==========================================
  Files          10       10              
  Lines        1507     1552      +45     
==========================================
+ Hits         1281     1326      +45     
  Misses        226      226              

Impacted Files	Coverage Δ
src/ArrayLayouts.jl	85.80% <ø> (+0.18%)	⬆️
src/muladd.jl	75.66% <66.66%> (+0.43%)	⬆️
src/factorizations.jl	90.18% <0.00%> (+0.18%)	⬆️
src/mul.jl	83.81% <0.00%> (+0.18%)	⬆️
src/triangular.jl	95.92% <0.00%> (+0.23%)	⬆️
src/memorylayout.jl	82.97% <0.00%> (+0.50%)	⬆️
src/ldiv.jl	78.89% <0.00%> (+1.22%)	⬆️
src/lmul.jl	85.96% <0.00%> (+1.65%)	⬆️

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