Fix typo in Cargo.toml category

[howardwu]

Motivation

Fixing a typo in the category slug in 2 Cargo.toml files

[codecov]

Codecov Report

Merging #500 (15592e8) into master (9038c5a) will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #500      +/-   ##
==========================================
- Coverage   73.63%   73.38%   -0.25%     
==========================================
  Files         458      458              
  Lines       13653    13653              
==========================================
- Hits        10053    10019      -34     
- Misses       3600     3634      +34     

Impacted Files	Coverage Δ
compiler/src/expression/arithmetic/mul.rs	0.00% <0.00%> (-23.81%)	⬇️
compiler/src/expression/expression.rs	87.57% <0.00%> (-4.15%)	⬇️
compiler/tests/integers/int_macro.rs	92.15% <0.00%> (-2.95%)	⬇️
compiler/src/value/integer/integer.rs	91.86% <0.00%> (-2.72%)	⬇️
ast/src/expression.rs	70.72% <0.00%> (-1.45%)	⬇️
grammar/src/ast.rs	93.25% <0.00%> (-1.13%)	⬇️

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