bump: rust 1.64.0

[baszalmstra]

Bumps rust to 1.64.0. Should decrease windows compilation times!

[codecov]

Codecov Report

Merging #474 (df59b55) into main (e07e077) will increase coverage by 0.02%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   79.27%   79.30%   +0.02%     
==========================================
  Files         256      256              
  Lines       13489    13491       +2     
==========================================
+ Hits        10694    10699       +5     
+ Misses       2795     2792       -3     

Impacted Files	Coverage Δ
crates/mun_compiler/src/db.rs	72.72% <ø> (ø)
crates/mun_hir/src/diagnostics.rs	76.73% <ø> (ø)
crates/mun_hir/src/path.rs	84.41% <ø> (ø)
crates/mun_language_server/src/db.rs	83.33% <ø> (ø)
crates/mun_project/src/manifest.rs	90.47% <ø> (ø)
crates/mun_project/src/package.rs	100.00% <ø> (ø)
crates/mun_target/src/spec.rs	86.36% <ø> (ø)
crates/mun_abi/src/dispatch_table.rs	75.00% <50.00%> (ø)
crates/mun_abi/src/type_lut.rs	89.47% <100.00%> (ø)
crates/mun_syntax/src/syntax_kind/generated.rs	93.56% <0.00%> (+0.03%)	⬆️
... and 3 more

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