chore(bazel): update protobuf to v3.21.7

PiperOrigin-RevId: 477955264

Source-Link: googleapis/googleapis@a724450

Source-Link: googleapis/googleapis-gen@4abcbca
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNGFiY2JjYWVjODU1ZTc0YTBiMjJhNDk4OGNmOWUwZWI2MWE4MzA5NCJ9

google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceSettings.java → owl-bot-staging/v1/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceSettings.java

@@ -28,6 +28,7 @@
 import com.google.api.gax.rpc.ClientContext;
 import com.google.api.gax.rpc.ClientSettings;
 import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.StubSettings;
 import com.google.api.gax.rpc.TransportChannelProvider;
 import com.google.api.gax.rpc.UnaryCallSettings;
 import com.google.cloud.trace.v1.stub.TraceServiceStubSettings;

google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java → owl-bot-staging/v1/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java

@@ -35,6 +35,7 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;