google-cloud-logging brings in xds, services, and netty-shaded versions
1.43.2. grpc-netty-shaded and xds use internal APIs, so their version
needs to align with grpc-api and grpc-core.  OpenCensus stackdriver
components also brings in netty-shaded version 1.27.2, but it was later
in the dependency list so google-cloud-logging's versions won out even
if using Maven.

We don't need an explicit dependency on netty-shaded because xds depends
on it transitively.

This was discovered because our GAE interop test failed in the course of
PR #9858 which added grpc-gcp-observability to interop-testing (and thus
also gae-interop-test):
```
Caused by: java.lang.AbstractMethodError: io.grpc.ManagedChannelProvider.getSupportedSocketAddressTypes()Ljava/util/Collection;
    at io.grpc.ManagedChannelRegistry.newChannelBuilder(ManagedChannelRegistry.java:186)
    at io.grpc.ManagedChannelRegistry.newChannelBuilder(ManagedChannelRegistry.java:155)
    at io.grpc.Grpc.newChannelBuilder(Grpc.java:101)
    at io.grpc.testing.integration.LongLivedChannel.<init>(LongLivedChannel.java:44)
    ... 44 more
```