Fix rstrip bug in publish_model.py

[r-barnes]

Motivation

.rstrip(".pth") will convert pthhtp.pth to the empty string. This is a bug.

removesuffix does the right thing, but works only from Python 3.10 up.

Modification

rstrip -> removesuffix

BC-breaking (Optional)

Only works with Python 3.10+.

Use cases (Optional)

N/A

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

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