Add the workflow that publishes the arcadedb-embedded shim #566

The arcadedb-embedded shim (#512, merged) builds from the merge commit (7212e5f01b), build_shims.py --check-pypi reads 26.11.1 as the correct next version, and twine check passes on the wheel and the sdist. What is missing is a way to publish it: trusted publishing only works from a workflow, and bindings/python/deprecation/README.md holds the ready one but it is not in .github/workflows/.

I will add it as publish-deprecation-shims.yml (manual dispatch, a publish input that is off by default, the existing pypi environment). The one step that stays with the PyPI account owner is registering the trusted publisher on the arcadedb-embedded project (repository humemai/arcadedb-embedded-python, workflow publish-deprecation-shims.yml, environment pypi).