Bump Xamarin.Google.Guava from 31.1.0.3 to 31.1.0.8

Bumps [Xamarin.Google.Guava](https://github.com/xamarin/AndroidX) from 31.1.0.3 to 31.1.0.8.
- [Commits](https://github.com/xamarin/AndroidX/commits)

---
updated-dependencies:
- dependency-name: Xamarin.Google.Guava
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

ExoPlayer.Common/ExoPlayer.Common.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AssemblyName>ExoPlayer.Common</AssemblyName>
     <RootNamespace>ExoPlayer.Common</RootNamespace>
@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Xamarin.AndroidX.Annotation" Version="1.4.0" />
-    <PackageReference Include="Xamarin.Google.Guava" Version="31.1.0.3" />
+    <PackageReference Include="Xamarin.Google.Guava" Version="31.1.0.8" />
   </ItemGroup>
 
 </Project>