Fix: EF version based on target framework (coscine/issues#2087)

src/Database/Database.csproj

@@ -9,7 +9,7 @@
 	<PropertyGroup>
 		<Authors>RWTH Aachen University</Authors>
 		<Company>IT Center, RWTH Aachen University</Company>
-		<Copyright>2021 IT Center, RWTH Aachen University</Copyright>
+		<Copyright>2022 IT Center, RWTH Aachen University</Copyright>
 		<Description>Database is a part of the Coscine group.</Description>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>
 		<PackageProjectUrl>https://git.rwth-aachen.de/coscine/backend/libraries/database</PackageProjectUrl>
@@ -32,9 +32,12 @@
 		<PackageReference Include="Coscine.Configuration" Version="2.*-*" />
 		<PackageReference Include="LinqKit" Version="1.1.23" />
 		<PackageReference Include="Inflector.NetStandard" Version="1.2.2" />
+		<!-- Note: use newest Microsoft.EntityFrameworkCore Version for net6.0 -->
+		<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.4" PrivateAssets="all" />
+		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.4" />
 		<!-- Note: use Microsoft.EntityFrameworkCore Version 3.x.x for compatibility with net461 -->
-		<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.12" PrivateAssets="all" />
-		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.12" />
+		<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.1.12" Condition="'$(TargetFramework)' == 'net461'" PrivateAssets="all" />
+		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.12" Condition="'$(TargetFramework)' == 'net461'" />
 	</ItemGroup>
 	<PropertyGroup>
 		<LangVersion>Preview</LangVersion>