[llvm] Bump ProGraML version to v0.3.2.

[ChrisCummins]

ProGraML v0.3.2 fixes a bug in which the outgoing edge position was 0
for all outgoing edges of a block, regardless of how many unique edges
there are.

[codecov-commenter]

Codecov Report

Merging #552 (2498656) into development (d5d60b6) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #552      +/-   ##
===============================================
- Coverage        88.26%   88.25%   -0.02%     
===============================================
  Files              114      114              
  Lines             6708     6708              
===============================================
- Hits              5921     5920       -1     
- Misses             787      788       +1     

Impacted Files	Coverage Δ
compiler_gym/envs/compiler_env.py	91.83% <0.00%> (-0.50%)	⬇️
compiler_gym/util/download.py	95.52% <0.00%> (+1.49%)	⬆️

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