Pin Python version

[Fi5t]

I tried to build a Docker container and encountered this error:

Collecting filebytes>=0.10.0 (from ropper==1.13.13)
    Downloading filebytes-0.10.2.tar.gz (20 kB)
    Installing build dependencies: started
    Installing build dependencies: finished with status 'done'
    Getting requirements to build wheel: started
    Getting requirements to build wheel: finished with status 'error'
    error: subprocess-exited-with-error

    × Getting requirements to build wheel did not run successfully.
    │ exit code: 1
    ╰─> [24 lines of output]
        Traceback (most recent call last):
          File "/usr/local/lib/python3.14/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
            main()
            ~~~~^^
          File "/usr/local/lib/python3.14/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
            json_out["return_val"] = hook(**hook_input["kwargs"])
                                     ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
          File "/usr/local/lib/python3.14/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
            return hook(config_settings)
          File "/tmp/pip-build-env-977i77r8/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 333, in get_requires_for_build_wheel
            return self._get_build_requires(config_settings, requirements=[])
                   ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
          File "/tmp/pip-build-env-977i77r8/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
            self.run_setup()
            ~~~~~~~~~~~~~~^^
          File "/tmp/pip-build-env-977i77r8/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 520, in run_setup
            super().run_setup(setup_script=setup_script)
            ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
          File "/tmp/pip-build-env-977i77r8/overlay/lib/python3.14/site-packages/setuptools/build_meta.py", line 317, in run_setup
            exec(code, locals())
            ~~~~^^^^^^^^^^^^^^^^
          File "<string>", line 19, in <module>
          File "<string>", line 11, in extractMetaInfo
        AttributeError: module 'ast' has no attribute 'Str'
        [end of output]

    note: This error originates from a subprocess, and is likely not a problem with pip.

I was able to fix it by pinning the Python version.

Root cause: FROM python pulled Python 3.14, which removed ast.Str (gone since 3.12). The filebytes dependency uses ast.Str in its build system, so it crashes on 3.12+. Pinning to python:3.11 resolves this.