Fix: Apply `invenio-accounts` API Changes

[Samk13]

:heart: Thank you for your contribution!

Description

Fix failing tests

tests/conftest.py:27: in <module>
    from invenio_accounts.views import blueprint as accounts_blueprint
E   ImportError: cannot import name 'blueprint' from 'invenio_accounts.views' (/opt/hostedtoolcache/Python/3.7.17/x64/lib/python3.7/site-packages/invenio_accounts/views/__init__.py)

• This commit addresses compatibility issues caused by the recent API changes in the invenio-accounts module that is introduced in this commit. It removes the usage of accounts_blueprint from invenio_files_rest and related tests, as it is no longer required and causes failures in the continuous integration (CI) tests. The change is aligned with the new release notes of invenio-accounts where this modification has been documented.

• Updates the Sphinx dependency to >=5.0.0,<6.0.0 addresses tests failing to lunch:

  ImportError: cannot import name 'formatargspec' from 'inspect'

  to resolve a compatibility issue with Python 3.11. This update is critical as formatargspec, used in celery.contrib.sphinx, has been removed in the new Python version. These changes align with ongoing efforts to upgrade Invenio to Python >3.11.

Checklist

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[utnapischtim]

Note: @Samk13 could you add a little bit more context to the commit message e.g. why this change fixed the CI. i would add something like: due to changes in the invenio-accounts api. with a reference to the new release. i usually don't do that either, but would be a good idea to do it. the reason is that for the reviewer it is easier to understand why this was necessary. And not to be neglected for other guys who will search for fixes of bugs in the future will understand why this change was made.