Bump protobuf from 3.20.3 to 4.25.8 in /docker/tensorrt

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.20.3 to 4.25.8.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.20.3...v4.25.8)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 4.25.8
  dependency-type: direct:production
...

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

docker/tensorrt/requirements-amd64.txt

@@ -14,4 +14,4 @@ nvidia-cufft-cu11==10.*; platform_machine == 'x86_64'
 nvidia-cufft-cu12==11.*; platform_machine == 'x86_64'
 onnx==1.16.*; platform_machine == 'x86_64'
 onnxruntime-gpu==1.20.*; platform_machine == 'x86_64'
-protobuf==3.20.3; platform_machine == 'x86_64'
+protobuf==4.25.8; platform_machine == 'x86_64'

docker/tensorrt/requirements-models-arm64.txt

@@ -1,3 +1,3 @@
 onnx == 1.14.0; platform_machine == 'aarch64'
-protobuf == 3.20.3; platform_machine == 'aarch64'
+protobuf == 4.25.8; platform_machine == 'aarch64'
 numpy == 1.23.*; platform_machine == 'aarch64'  # required by python-tensorrt 8.2.1 (Jetpack 4.6)