Replace rust_cxx_bridge implementation by the simpler one from CXX

PiperOrigin-RevId: 828670106

Author: schoppmp

bazel/BUILD

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-load("//bazel:rust_cxx_bridge.bzl", "rust_cxx_bridge")
+load("@cxx.rs//tools/bazel:rust_cxx_bridge.bzl", "rust_cxx_bridge")
 load("@rules_cc//cc:cc_library.bzl", "cc_library")
 load("@rules_cc//cc:cc_test.bzl", "cc_test")
 load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")