Bump System.Text.RegularExpressions (#2540)

Bumps System.Text.RegularExpressions from 4.3.0 to 4.3.1.

---
updated-dependencies:
- dependency-name: System.Text.RegularExpressions
  dependency-type: direct:production
...

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test/UnitTest/Microsoft.AspNet.OData.Test.Shared/packages.config

@@ -38,7 +38,7 @@
   <package id="System.Runtime.Numerics" version="4.3.0" targetFramework="net45" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="net45" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="net45" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="net45" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="net45" />
   <package id="System.Threading" version="4.3.0" targetFramework="net45" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="net45" />
   <package id="System.Xml.ReaderWriter" version="4.3.0" targetFramework="net45" />