Release GAX 2.10.0

Changes since 2.9.0:

- Support for Cloud Run as a new Platform
- Added a new LocationName common resource name
- Added Format method to all resource names
- Update all dependencies
- Constrain gRPC dependencies to 1.x
- Add a new ServiceEndpoint(string) constructor
- Use "gke_container" instead of "container" for monitored resources

ReleaseVersion.xml

@@ -5,6 +5,6 @@
     - divergent versions, but for the moment this keeps things simpler.
     -->
   <PropertyGroup>
-    <Version>2.10.0-beta04</Version>
+    <Version>2.10.0</Version>
   </PropertyGroup>
 </Project>