Update Microsoft.Extensions.Configuration.Json requirement

Updates the requirements on [Microsoft.Extensions.Configuration.Json](https://github.com/dotnet/runtime) to permit the latest version.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/templates/MyProject.Scheduler/MyProject.Scheduler.csproj

@@ -7,7 +7,7 @@
 		<Description>MyProject.Scheduler service</Description>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.*" />
+		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.*" />
 		<PackageReference Include="Simplify.Scheduler" Version="1.3.*" />
 	</ItemGroup>
 	<ItemGroup>

src/templates/MyProject.WindowsService/MyProject.WindowsService.csproj

@@ -7,7 +7,7 @@
 		<Description>MyProject.WindowsService service</Description>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.*" />
+		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.*" />
 		<PackageReference Include="Simplify.WindowsServices" Version="2.14.*" />
 	</ItemGroup>
 	<ItemGroup>