Update Microsoft.EntityFrameworkCore requirement from 5.* to 7.*

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

---
updated-dependencies:
- dependency-name: Microsoft.EntityFrameworkCore
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/Samples/Sample.AspNetCore/Sample.AspNetCore.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.*" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.*" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="6.*" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.*" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.*">