Fluent-validation

Fix assembly version was still 8.

Removed support for netstandard1.1, netstandard1.6 and net45 (net461 still supported)
Removed support for unsupported .NET Core versions (2.2 and 3.0). LTS versions are supported (2.1 and 3.1)
Default email validation mode now uses the same logic as ASP.NET Core. Previous regex behaviour is opt-in.
TestHelper advanced mode now has more features (see https://docs.fluentvalidation.net/en/latest/testing.html#advanced-test-extensions)
Equal/NotEqual now perform ordinal comparison when used with string properties
Severity can now be set dynamically with a callback
Removed WithLocalizedMessage (WithMessage that takes a callback is the replacement)
Removed ResourceName from ValidationFailure
Removed ResourceName and ResourceType from IStringSource.

Fix CollectionIndex placeholder not working with async workflow.

Add explicit netcoreapp3.1 target to ASP.NET Core integration.

Ensure lazily loaded calls to WithMessage can be used for client-side validation, provided they don't attempt to access model properties from inside the delegate (eg when using IStringLocalizer).
Fix issue where OnFailure didn't work properly when invoked on validators with conditions.