Bump System.Data.SqlClient from 4.6.0 to 4.7.0 (#37)

Bumps [System.Data.SqlClient](https://github.com/dotnet/corefx) from 4.6.0 to 4.7.0.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

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

Author: dependabot-preview[bot]

AlwaysEncryptedSample.Models.Tests/packages.config

@@ -5,5 +5,5 @@
   <package id="NMemory" version="3.1.0" targetFramework="net461" />
   <package id="NUnit" version="3.11.0" targetFramework="net461" />
   <package id="NUnit3TestAdapter" version="3.13.0" targetFramework="net461" />
-  <package id="System.Data.SqlClient" version="4.6.0" targetFramework="net461" />
+  <package id="System.Data.SqlClient" version="4.7.0" targetFramework="net461" />
 </packages>