intersphinx exposes basic auth password if connection fails

Describe the bug

When using basic auth for inter-sphinx, sphinx will display the uncensored credentials if there is any error accessing the objects.inv file.

see https://github.com/jamesharris-garmin/intersphinx-bad-auth-example/blob/main/README.md for a complete description.

How to Reproduce

I have included a minimal reproducible case at this repository jamesharris-garmin/intersphinx-bad-auth-example

Environment Information

Platform:              linux; (Linux-6.8.0-101-generic-x86_64-with-glibc2.35)
Python version:        3.13.0 (main, Oct 16 2024, 03:23:02) [Clang 18.1.8 ])
Python implementation: CPython
Sphinx version:        9.1.0
Docutils version:      0.22.4
Jinja2 version:        3.1.6
Pygments version:      2.19.2

Sphinx extensions

'sphinx.ext.intersphinx'

Additional context

This is especially bad if the correct credentials are present in the URL but the URL is otherwise wrong causing additional issues.

Reproduce the failure using the linked intersphinx-bad-auth-example and inspect the sphinx.ext.intersphinx error path used when accessing objects.inv. Trace how the authenticated URL is included in the failure output; done means connection errors no longer expose the basic-auth password while still reporting the access problem.