Remove unneeded lock.

[maleadt]

JuliaLang/julia#39621 is part of 1.6, the only version we support here.

[codecov]

Codecov Report

Merging #905 (b52942d) into master (760716e) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #905      +/-   ##
==========================================
- Coverage   77.26%   77.26%   -0.01%     
==========================================
  Files         121      121              
  Lines        7567     7566       -1     
==========================================
- Hits         5847     5846       -1     
  Misses       1720     1720              

Impacted Files	Coverage Δ
lib/cudadrv/occupancy.jl	91.66% <50.00%> (-0.34%)	⬇️

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