Bump protobuf from 3.20.3 to 5.29.6 in /docker/tensorrt in the pip-trt-security group across 1 directory (#24825)

* Bump protobuf

Bumps the pip-trt-security group with 1 update in the /docker/tensorrt directory: [protobuf](https://developers.google.com/protocol-buffers/).


Updates `protobuf` from 3.20.3 to 5.29.6

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 5.29.6
  dependency-type: direct:production
  dependency-group: pip-trt-security
...

Signed-off-by: dependabot[bot] <support@github.com>

* keep amd64 tensorrt protobuf on 7.36

Dependabot moved every protobuf pin in docker/tensorrt to 5.29, but the security alerts only cover the aarch64 pin. On amd64 that would downgrade protobuf below what TensorFlow 2.21 requires (>=6.31.1), and the image would build with a pip warning and fail at import tensorflow. This keeps the aarch64 change to 5.29.6, which is the same change verified on #24350 (onnx 1.14.0 and TensorFlow 2.19 both work on it).

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>

docker/tensorrt/requirements-models-arm64.txt

@@ -1,2 +1,2 @@
 onnx == 1.14.0; platform_machine == 'aarch64'
-protobuf == 3.20.3; platform_machine == 'aarch64'
+protobuf == 5.29.6; platform_machine == 'aarch64'