Update docker requirements.txt for ONNX 1.15.0 release

### Describe the feature request

This is serves as a reminder to update with requirement for ONNX 1.15.0 in multiple requirements.txt after ONNX 1.15.0 release. Reference to this PR where 3 requirements.txt files need to be updated:
https://github.com/microsoft/onnxruntime/pull/15680/files#diff-e389e46569987c6b08b4e77e4d9b97222b83ba313c3c806c0a3c995dda430806

### Describe scenario use case

this issue serves as a tracker/reminder

Start with the linked pull request and inspect the three requirements.txt files shown in its diff. Update the ONNX requirement to 1.15.0 in the Docker-related files, then verify that all three files consistently reference the requested release.

Written by the indexing model from the issue text.