Bump MongoDB.Driver in /test/EntityFramework.DynamicLinq.Tests.net452 (#681)

Bumps [MongoDB.Driver](https://github.com/mongodb/mongo-csharp-driver) from 2.4.4 to 2.19.0.
- [Release notes](https://github.com/mongodb/mongo-csharp-driver/releases)
- [Commits](mongodb/mongo-csharp-driver@v2.4.4...v2.19.0)

---
updated-dependencies:
- dependency-name: MongoDB.Driver
  dependency-type: direct:production
...

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test/EntityFramework.DynamicLinq.Tests.net452/packages.config

@@ -7,7 +7,7 @@
   <package id="Microsoft.AspNet.Identity.Core" version="2.2.1" targetFramework="net452" />
   <package id="Microsoft.AspNet.Identity.EntityFramework" version="2.2.1" targetFramework="net452" />
   <package id="MongoDB.Bson" version="2.4.4" targetFramework="net452" />
-  <package id="MongoDB.Driver" version="2.4.4" targetFramework="net452" />
+  <package id="MongoDB.Driver" version="2.19.0" targetFramework="net452" />
   <package id="MongoDB.Driver.Core" version="2.4.4" targetFramework="net452" />
   <package id="Moq" version="4.13.1" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />