Bump FirebirdSql.Data.FirebirdClient from 6.6.0 to 8.5.4

Bumps [FirebirdSql.Data.FirebirdClient](https://github.com/FirebirdSQL/NETProvider) from 6.6.0 to 8.5.4.
- [Release notes](https://github.com/FirebirdSQL/NETProvider/releases)
- [Commits](FirebirdSQL/NETProvider@6.6.0.0...8.5.4.0)

---
updated-dependencies:
- dependency-name: FirebirdSql.Data.FirebirdClient
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/NHibernate.Test/NHibernate.Test.csproj

@@ -63,7 +63,7 @@
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
-    <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="8.5.2" />
+    <PackageReference Include="FirebirdSql.Data.FirebirdClient" Version="8.5.4" />
     <PackageReference Include="Npgsql" Version="4.1.9" />
     <PackageReference Include="MySql.Data" Version="8.0.26" />
   </ItemGroup>