Update Rust toolchains for /libs to nightly-2023-05-08

[renovate]

This PR contains the following updates:

Package	Update	Change
rust	minor	2023-04-17 -> 2023-05-08

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[TimDiekmann]

@indietyp could you take a look at the failing CIs for antsi and deer please?

[codecov]

Codecov Report

Merging #2521 (925a461) into main (228a100) will increase coverage by 0.36%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2521      +/-   ##
==========================================
+ Coverage   55.59%   55.95%   +0.36%     
==========================================
  Files         331      319      -12     
  Lines       26909    26636     -273     
  Branches      453      412      -41     
==========================================
- Hits        14959    14904      -55     
+ Misses      11945    11731     -214     
+ Partials        5        1       -4     

Flag	Coverage Δ
antsi	0.00% <ø> (-0.36%)	⬇️
backend-integration-tests	3.66% <ø> (ø)
deer	66.45% <100.00%> (-0.04%)	⬇️
error-stack	82.54% <ø> (-0.02%)	⬇️
hash-status	0.00% <ø> (-2.71%)	⬇️
sarif	100.00% <ø> (ø)
unit-tests	0.00% <ø> (-1.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
libs/error-stack/src/lib.rs	33.33% <ø> (-5.13%)	⬇️
libs/deer/src/impls/core/array.rs	75.22% <100.00%> (ø)
libs/deer/src/lib.rs	70.48% <100.00%> (-0.11%)	⬇️

... and 21 files with indirect coverage changes

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[indietyp]

antsi: const traits are getting ripped out of Rust (rust-lang/rust#111275, rust-lang/rust#110393), pending a rework. This needs a separate PR that removes them from the codebase. There is currently no equivalent AFAIK, which means we need to do a bit of rethinking.

Removal tracked in rust-lang/rust#110395

[renovate]

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