Remove unused import to get rid of warnings (#21204)

Signed-off-by: Raven Black <ravenblack@dropbox.com>

Mirrored from https://github.com/envoyproxy/envoy @ d0004b94e366e51f95f84330ae61900f41345efc

contrib/envoy/extensions/filters/network/sip_proxy/tra/v3alpha/tra.proto

@@ -8,7 +8,6 @@ import "envoy/config/core/v3/grpc_service.proto";
 import "google/protobuf/duration.proto";
 
 import "udpa/annotations/status.proto";
-import "udpa/annotations/versioning.proto";
 import "validate/validate.proto";
 
 option java_package = "io.envoyproxy.envoy.extensions.filters.network.sip_proxy.tra.v3alpha";