chore: Update OCORE submodules and align package versions

Pull OCORE, OCORE_web and OCORE_web_pdf to their latest main commits.
OCORE bumped MimeKit to 4.18.1 and Microsoft.Data.SqlClient to 7.1.0,
which made restore fail with NU1605 package-downgrade errors in Fuchs
and Fuchs_DataService; raise both pins to match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fuchs/Fuchs.csproj

@@ -47,10 +47,10 @@
 	  <PackageReference Include="Spire.PDF" Version="[8.10.5,8.10.5]" allowedVersions="[8.10.5,8.10.5]" />
     <!-- Updated packages -->
     <PackageReference Include="BouncyCastle.Cryptography" Version="2.7.0" />
-    <PackageReference Include="MimeKit" Version="4.18.0" />
+    <PackageReference Include="MimeKit" Version="4.18.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <!-- New packages (needed for .NET 10) -->
-    <PackageReference Include="Microsoft.Data.SqlClient" Version="7.0.3" />
+    <PackageReference Include="Microsoft.Data.SqlClient" Version="7.1.0" />
     <PackageReference Include="SixLabors.ImageSharp" Version="4.1.2" />
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.12" />
     <PackageReference Include="System.Drawing.Common" Version="10.0.12" />

Fuchs_DataService/Fuchs_DataService.csproj

@@ -28,7 +28,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="Microsoft.Data.SqlClient" Version="7.0.3" />
+    <PackageReference Include="Microsoft.Data.SqlClient" Version="7.1.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.12" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.12" />
   </ItemGroup>