bump: rust 1.47

[baszalmstra]

Title says it all.

Fixed #282

[codecov]

Codecov Report

Merging #279 into master will increase coverage by 0.56%.
The diff coverage is 37.74%.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
+ Coverage   78.82%   79.39%   +0.56%     
==========================================
  Files         220      220              
  Lines       13070    13004      -66     
==========================================
+ Hits        10303    10324      +21     
+ Misses       2767     2680      -87     

Impacted Files	Coverage Δ
crates/mun_hir/src/expr.rs	88.43% <ø> (+0.77%)	⬆️
crates/mun_syntax/src/syntax_kind/generated.rs	66.91% <0.00%> (+1.45%)	⬆️
crates/mun_hir/src/ty.rs	84.42% <50.00%> (+1.09%)	⬆️
crates/mun_hir/src/ty/lower.rs	88.42% <50.00%> (+1.22%)	⬆️
crates/mun_syntax/src/ast/extensions.rs	71.11% <66.66%> (-1.12%)	⬇️
crates/mun_syntax/src/ast/generated.rs	75.22% <77.04%> (+4.07%)	⬆️
crates/mun_abi/src/type_info.rs	83.07% <100.00%> (+1.12%)	⬆️
crates/mun_compiler/src/driver/display_color.rs	83.33% <100.00%> (+11.90%)	⬆️
crates/mun_syntax/src/parsing/grammar/paths.rs	75.00% <100.00%> (-3.13%)	⬇️
crates/mun_syntax/src/syntax_kind.rs	100.00% <100.00%> (ø)
... and 33 more

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