Bump dependency FluentValidation to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
FluentValidation (source)	11.11.0 -> 12.0.0

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Release Notes

JeremySkinner/fluentvalidation (FluentValidation)

v12.0.0

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Release notes

Please read the upgrade guide if you are moving from 11.x to 12.x

Changes in 12.0.0

• Drops support for netstandard2.0, netstandard2.1, .net 5, .net 6 and .net 7. Minimum supported platform is now .net 8.
• Add support for dependent rules for custom rules (#​2170)
• Removes deprecated DI extensions
• Removes deprecated transform methods (#​2027)
• Remove the ability to disable the root-model null check (#​2069)
• Use Zomp.SyncMethodGenerator to clean up internal sync/async code paths and increase performance (#​2136)
• Add Serbian (Cyrillic) language; rename existing Serbian to Serbian (Latin) (#​2283)

Downloads

Binaries can be downloaded from nuget:

• FluentValidation - Main package

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