Bump System.Text.RegularExpressions (#2538)

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/E2ETest/Microsoft.Test.E2E.AspNet.OData/Build.AspNet/packages.config

@@ -46,7 +46,7 @@
   <package id="System.Spatial" version="5.8.4" targetFramework="net452" />
   <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" />