Bump Npgsql from 4.0.2 to 8.0.3 in /Source/EventFlow.PostgreSql.Tests

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 4.0.2 to 8.0.3.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v4.0.2...v8.0.3)

---
updated-dependencies:
- dependency-name: Npgsql
  dependency-type: direct:production
...

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

Source/EventFlow.PostgreSql.Tests/EventFlow.PostgreSql.Tests.csproj

@@ -20,7 +20,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
-    <PackageReference Include="Npgsql" Version="4.0.2" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
   </ItemGroup>

Source/EventFlow.PostgreSql/EventFlow.PostgreSql.csproj

@@ -27,7 +27,7 @@
   <ItemGroup>
     <PackageReference Include="dbup-postgresql" Version="4.1.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
-    <PackageReference Include="Npgsql" Version="4.0.2" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
   </ItemGroup>
 
   <ItemGroup>