Bump Microsoft.Data.SqlClient from 3.0.0 to 3.1.5 in /test/dab-mssql

Bumps [Microsoft.Data.SqlClient](https://github.com/dotnet/sqlclient) from 3.0.0 to 3.1.5.
- [Release notes](https://github.com/dotnet/sqlclient/releases)
- [Changelog](https://github.com/dotnet/SqlClient/blob/main/CHANGELOG.md)
- [Commits](dotnet/SqlClient@v3.0.0...v3.1.5)

---
updated-dependencies:
- dependency-name: Microsoft.Data.SqlClient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

test/dab-mssql/aspnetapp.csproj

@@ -4,6 +4,6 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Program.cs" />
-    <PackageReference Include="Microsoft.Data.SqlClient" Version="3.0.0" />
+    <PackageReference Include="Microsoft.Data.SqlClient" Version="3.1.5" />
   </ItemGroup>
 </Project>