chore: update dependency dotnet-sdk to v6.0.421

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
dotnet-sdk	dotnet-sdk	patch	6.0.420 -> 6.0.421

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Release Notes

dotnet/sdk (dotnet-sdk)

### [`v6.0.421`](https://togithub.com/dotnet/sdk/releases/tag/v6.0.421): .NET 6.0.29 [Compare Source](https://togithub.com/dotnet/sdk/compare/v6.0.420...v6.0.421) [Release](https://togithub.com/dotnet/core/releases/tag/v6.0.29)

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