Switching httpRuntime to 4.7.2 (#8810)

Author: agr

src/NuGetGallery/Web.config

@@ -340,7 +340,7 @@
         <add tagPrefix="ef" assembly="Microsoft.AspNet.EntityDataSource" namespace="Microsoft.AspNet.EntityDataSource"/>
       </controls>
     </pages>
-    <httpRuntime targetFramework="4.5" maxQueryStringLength="12000" maxRequestLength="256000" requestPathInvalidCharacters="&lt;,&gt;,*,%,:,\,?" relaxedUrlToFileSystemMapping="true" enableVersionHeader="false"/>
+    <httpRuntime targetFramework="4.7.2" maxQueryStringLength="12000" maxRequestLength="256000" requestPathInvalidCharacters="&lt;,&gt;,*,%,:,\,?" relaxedUrlToFileSystemMapping="true" enableVersionHeader="false"/>
     <httpModules>
       <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah, Version=1.2.14706.0, Culture=neutral, PublicKeyToken=57eac04b2e0f138e, processorArchitecture=MSIL"/>
       <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah, Version=1.2.14706.0, Culture=neutral, PublicKeyToken=57eac04b2e0f138e, processorArchitecture=MSIL"/>