Update diesel to 2.0

[msrd0]

[codecov[bot]]

Codecov Report

Merging #601 (f086e6b) into main (84c7f08) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #601      +/-   ##
==========================================
+ Coverage   86.47%   86.55%   +0.07%     
==========================================
  Files         112      112              
  Lines        5871     5867       -4     
==========================================
+ Hits         5077     5078       +1     
+ Misses        794      789       -5     

Impacted Files	Coverage Δ
examples/diesel/src/models.rs	33.33% <ø> (ø)
middleware/diesel/src/lib.rs	80.00% <ø> (+20.90%)	:arrow_up:
examples/diesel/src/main.rs	87.64% <100.00%> (+0.43%)	:arrow_up:
middleware/diesel/src/repo.rs	71.42% <100.00%> (-4.77%)	:arrow_down:

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[msrd0]

We'll need to consider semver on this

diesel is a public dependency of the diesel middleware so this is definitely a breaking change

[svenfoo]

Is there a plan to get this merged? Just finished porting the ORM parts of a project to diesel-2.0 only to find out that gotham_middleware_diesel isn't compatible with it yet. Would be awesome to get this merged and released soon.

[msrd0]

@svenfoo I think my plan was to migrate my server code to diesel 2.0 and test these changes before I merge and release them, but that never happened. Given that the changes seems rather simple and we have tests, it's probably ok to merge this anyways.