bump: rust to 1.52.0

[baszalmstra]

Bumps rust to 1.52.0

[codecov]

Codecov Report

Merging #327 (4007add) into master (72dfbe2) will decrease coverage by 0.25%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #327      +/-   ##
==========================================
- Coverage   80.57%   80.32%   -0.26%     
==========================================
  Files         259      259              
  Lines       15561    15554       -7     
==========================================
- Hits        12539    12494      -45     
- Misses       3022     3060      +38     

Impacted Files	Coverage Δ
...rates/mun_codegen/src/code_gen/assembly_builder.rs	74.41% <ø> (ø)
crates/mun_codegen/src/module_group.rs	69.23% <ø> (ø)
...tes/mun_hir/src/name_resolution/path_resolution.rs	75.00% <ø> (-1.93%)	⬇️
crates/mun_runtime/src/adt.rs	76.00% <ø> (ø)
crates/mun_hir/src/module_tree.rs	86.73% <50.00%> (ø)
crates/mun_language_server/src/state.rs	88.88% <100.00%> (+0.53%)	⬆️
crates/mun_memory/src/diff.rs	94.85% <100.00%> (-0.08%)	⬇️
crates/mun_syntax/src/ast/expr_extensions.rs	93.14% <100.00%> (-0.08%)	⬇️
crates/mun_syntax/src/syntax_error.rs	59.25% <0.00%> (-7.41%)	⬇️
crates/mun_hir/src/ty/resolve.rs	62.50% <0.00%> (-6.25%)	⬇️
... and 26 more

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