Update Npgsql version to 7.0.x (#14)

Author: oleg3790

src/PgPartner/PgPartner.csproj

@@ -20,7 +20,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="5.0.7" />
+    <PackageReference Include="Npgsql" Version="7.0.2" />
     <PackageReference Include="System.Collections" Version="4.3.0" />
     <PackageReference Include="System.Runtime" Version="4.3.1" />
   </ItemGroup>