Updated dependencies to .NET 5 with EF Core 5

[bart-degreed]

Fixes #1026.

[codecov]

Codecov Report

Merging #1022 (6460471) into master (6b286aa) will increase coverage by 0.04%.
The diff coverage is 98.80%.

@@            Coverage Diff             @@
##           master    #1022      +/-   ##
==========================================
+ Coverage   91.06%   91.10%   +0.04%     
==========================================
  Files         254      254              
  Lines        6896     6894       -2     
==========================================
+ Hits         6280     6281       +1     
+ Misses        616      613       -3     

Impacted Files	Coverage Δ
...c/JsonApiDotNetCore/Serialization/JsonApiReader.cs	100.00% <ø> (ø)
.../JsonApiDotNetCore/Middleware/FixedQueryFeature.cs	60.86% <66.66%> (+1.77%)	⬆️
...cOperations/Processors/SetRelationshipProcessor.cs	100.00% <100.00%> (ø)
...NetCore/Configuration/InverseNavigationResolver.cs	100.00% <100.00%> (ø)
...NetCore/Configuration/JsonApiApplicationBuilder.cs	100.00% <100.00%> (ø)
.../JsonApiDotNetCore/Configuration/JsonApiOptions.cs	100.00% <100.00%> (ø)
...otNetCore/Configuration/JsonApiValidationFilter.cs	100.00% <100.00%> (ø)
src/JsonApiDotNetCore/Configuration/PageNumber.cs	46.66% <100.00%> (ø)
...e/Configuration/ResourceDescriptorAssemblyCache.cs	100.00% <100.00%> (ø)
...piDotNetCore/Configuration/ResourceGraphBuilder.cs	95.45% <100.00%> (ø)
... and 47 more

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