replace gone in python3.14 FancyURL

[dimpase]

FancyURL has been long deprecated, since Python 3.3.
It's finally gone in 3.14, so we need this to move forward, e.g. on Fedora 43,
as reported on sage-support

This will fix #40886

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies

[dimpase]

Downloading works, but uncompressing downloaded tarballs does not work on Python 3.14.

https://mirrors.mit.edu/sage/spkg/upstream/brial/brial-1.2.14.tar.bz2
[......................................................................]
Setting up build directory /home/dp/sage/local/var/tmp/sage/build/brial-1.2.14
Traceback (most recent call last):
  File "/home/dp/sage/build/bin/sage-uncompress-spkg", line 23, in <module>
    run()
    ~~~^^
  File "/home/dp/sage/build/bin/../sage_bootstrap/uncompress/cmdline.py", line 67, in run
    unpack_archive(archive, dirname)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/home/dp/sage/build/bin/../sage_bootstrap/uncompress/action.py", line 67, in unpack_archive
    archive.extractall(members=archive.names)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dp/sage/build/bin/../sage_bootstrap/uncompress/tar_file.py", line 99, in extractall
    return super(SageBaseTarFile, self).extractall(path=path,
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
                                                   members=members,
                                                   ^^^^^^^^^^^^^^^^
                                                   **kwargs)
                                                   ^^^^^^^^^
  File "/usr/lib64/python3.14/tarfile.py", line 2453, in extractall
    self.chmod(tarinfo, dirpath)
    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/home/dp/sage/build/bin/../sage_bootstrap/uncompress/tar_file.py", line 75, in chmod
    tarinfo.mode &= ~self.umask
TypeError: unsupported operand type(s) for &=: 'NoneType' and 'int'
************************************************************************
Error: failed to extract /home/dp/sage/upstream/brial-1.2.14.tar.bz2

[github-actions]

Documentation preview for this PR (built with commit b197437; changes) is ready! 🎉
This preview will update shortly after each push to this PR.

[enriqueartal]

For me, with #40882 and #40892, together with the patches in #40890, both downloading and uncompressing worked with python 3.14; testing now with 3.13 it seems to work also. Something special to be checked?

[dimpase]

I think this should suffice for a positive review

[dimpase]

perhaps check with some old Python 3, e.g. 3.8

[enriqueartal]

perhaps check with some old Python 3, e.g. 3.8

I do not have access to systems working with these versions. Is it a problem for a positive review?

[dimpase]

perhaps check with some old Python 3, e.g. 3.8

I do not have access to systems working with these versions. Is it a problem for a positive review?

Well, I tested with Python 3.8 as a "system" Python. (Actually, using uv, and running the build in an uv-managed venv, with ./configure --with-python3=python3.13, while python3 was 3.8.20). It all worked.
(downloading and untarring, two things affected by this PR)

I think it's good enough, you can turn this to a positive review.

PS. An additional, complete cleanup of these python2/3 old features can be done later.