chore: llvm dependency update

[volsa]

My recommendation for reviewing this PR would be to do it on a commit-basis since they're categorized by LLVM versions. That will also help understand the IR changes introduced with each LLVM version.

(Note for myself: I forgot to update the book documentation, which I should do before we merge this PR)

[codecov]

Codecov Report

❌ Patch coverage is 83.75000% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.94%. Comparing base (aca5a52) to head (8d817d6).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/codegen/generators/expression_generator.rs	77.63%	51 Missing ⚠️
src/builtins.rs	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1557      +/-   ##
==========================================
- Coverage   95.00%   94.94%   -0.06%     
==========================================
  Files         175      174       -1     
  Lines       56038    56246     +208     
==========================================
+ Hits        53239    53403     +164     
- Misses       2799     2843      +44     

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