Bump Oracle.ManagedDataAccess from 12.1.2400 to 21.4.0

Bumps Oracle.ManagedDataAccess from 12.1.2400 to 21.4.0.

---
updated-dependencies:
- dependency-name: Oracle.ManagedDataAccess
  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

@@ -74,7 +74,7 @@
     <Reference Include="System.Threading.Tasks" />
     <Reference Include="System.Data.OracleClient" />
     <PackageReference Include="Microsoft.SqlServer.Compact" Version="4.0.8876.1" />
-    <PackageReference Include="Oracle.ManagedDataAccess" Version="19.12.0" />
+    <PackageReference Include="Oracle.ManagedDataAccess" Version="21.4.0" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='netcoreapp2.0'">
     <PackageReference Include="System.CodeDom" Version="4.7.0" />