chore(deps): update dependency npgsql.entityframeworkcore.postgresql to 2.2.4

Author: renovate-bot

Bookshelf/Bookshelf.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="Google.Cloud.Firestore" Version="1.0.0-beta20" />
     <PackageReference Include="Google.Cloud.Storage.V1" Version="2.4.0-beta01" />
     <PackageReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.1.2" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.2.4" />
   </ItemGroup>
 
   <ItemGroup>