update rbe platform to latest

this fixes the breakage of the remote execution pipeline on buildkite

RELNOTES: NONE
PiperOrigin-RevId: 238604667
diff --git a/BUILD b/BUILD
index d2be691..c0f94f3 100644
--- a/BUILD
+++ b/BUILD
@@ -126,7 +126,7 @@
 
 platform(
     name = "rbe_ubuntu1604_with_network_and_privileged",
-    parents = ["@bazel_toolchains//configs/ubuntu16_04_clang/1.1:rbe_ubuntu1604"],
+    parents = ["@bazel_toolchains//configs/ubuntu16_04_clang/latest:platform"],
     remote_execution_properties = """
         {PARENT_REMOTE_EXECUTION_PROPERTIES}
         properties: {