Update Npgsql package

Author: alex-kulakov

Orm/Xtensive.Orm.PostgreSql/Xtensive.Orm.PostgreSql.csproj

@@ -25,7 +25,7 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="9.0.3" />
+    <PackageReference Include="Npgsql" Version="9.0.4" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Xtensive.Orm\Xtensive.Orm.csproj" />

Orm/Xtensive.Orm.Tests/Xtensive.Orm.Tests.csproj

@@ -20,7 +20,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
-    <PackageReference Include="Npgsql" Version="9.0.3" />
+    <PackageReference Include="Npgsql" Version="9.0.4" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.0" />
     <PackageReference Include="System.CodeDom" Version="4.4.0" />