Bump Xamarin.Android.Volley from 1.1.1.1 to 1.2.1.7

Bumps [Xamarin.Android.Volley](https://github.com/xamarin/GooglePlayServicesComponents) from 1.1.1.1 to 1.2.1.7.
- [Release notes](https://github.com/xamarin/GooglePlayServicesComponents/releases)
- [Commits](https://github.com/xamarin/GooglePlayServicesComponents/commits)

---
updated-dependencies:
- dependency-name: Xamarin.Android.Volley
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Microsoft.Azure.NotificationHubs.Client/Microsoft.Azure.NotificationHubs.Client.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="MSBuild.Sdk.Extras/3.0.38">
+<Project Sdk="MSBuild.Sdk.Extras/3.0.38">
   <PropertyGroup>
     <OutputType>Library</OutputType>
     <RootNamespace>Microsoft.Azure.NotificationHubs.Client</RootNamespace>
@@ -59,7 +59,7 @@
     <PackageReference Include="Xamarin.Google.Android.DataTransport.TransportBackendCct" Version="3.0.0.1" />
     <PackageReference Include="Xamarin.GooglePlayServices.Iid" Version="117.0.0.3" />
     <PackageReference Include="Xamarin.GooglePlayServices.Base" Version="117.6.0.3" />
-    <PackageReference Include="Xamarin.Android.Volley" Version="1.1.1.1" />
+    <PackageReference Include="Xamarin.Android.Volley" Version="1.2.1.7" />
     <PackageReference Include="Xamarin.Azure.NotificationHubs.Android" Version="1.1.4.1" />
 
     <!-- Android files have android.cs -->