Bump Microsoft.Extensions.Configuration.Json from 3.1.0 to 3.1.2

[dependabot-preview[bot]]

Bumps Microsoft.Extensions.Configuration.Json from 3.1.0 to 3.1.2.

Release notes

Sourced from Microsoft.Extensions.Configuration.Json's releases.

.NET Core 3.1.2

Release Notes Install Instructions

Repos

Release Notes Install Instructions

• CLI
• CoreCLR
• Core-Setup
• ASP
• Toolset
• Core-sdk
• SDK
• Entity Framework 6
• EF Core
• Extensions
• ASPNETCORE-Tooling
• ASPNET/WebSDK
• WPF

Commits

• 1286a6f Revert "Remove ref project from Microsoft.AspNetCore.Testing (#2817)" (#2882)
• 28c68e2 [release/3.1] Update dependencies from dotnet/core-setup (#2878)
• 9f358d9 Update dependencies from https://github.com/dotnet/core-setup build 20200116....
• decdd34 [release/3.1] Update dependencies from dotnet/roslyn dotnet/core-setup (#2875)
• f104d44 Update dependencies from https://github.com/dotnet/core-setup build 20200116....
• 08a9b86 Merge pull request #2710 from dotnet/rynowak/http-client-factory-fixes
• edcf5f2 All duplicates of the same type with different names
• 9c9ac59 WIP
• f198c46 Allow multiple types to be registered for one name
• b2165d7 Allow duplicate class to AddHttpClient<T>
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #104.

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