chore(deps): update nuget monorepo to 6.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
NuGet.Frameworks (source)	6.11.1 -> 6.12.1
NuGet.Protocol (source)	6.11.1 -> 6.12.1

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Configuration

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
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0.0% Coverage on New Code
0.0% Duplication on New Code

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