Remove future package from constraints for tests

[dependabot[bot]]

Bumps future from 0.18.3 to 1.0.0.

Release notes

Sourced from future's releases.

v1.0.0

The new version number of 1.0.0 indicates that the python-future project, like Python 2, is now done.

The most important change in this release is adding support for Python 3.12 (ba1cc50 and a6222d2 and bcced95).

This release also includes these fixes:

• Small updates to the docs
• Add SECURITY.md describing security policy (0598d1b)
• Fix pasteurize: NameError: name 'unicode' is not defined (de68c10)
• Move CI to GitHub Actions (8cd11e8)
• Add setuptools to requirements for building docs (0c347ff)
• Fix typos in docs (350e87a)
• Make the fix_unpacking fixer more robust (de68c10)
• Small improvements to shell scripts according to shellcheck (6153844)

Changelog

Sourced from future's changelog.

.. _whats-old:

Changes in previous versions

---

Changes in the most recent major version are here: :ref:whats-new.

Commits

• 2bdbfa5 Tidy up README
• a7097f8 Update docs
• e32250e Update docs pointing to changelog
• dde60ad Move old "What's New" entries to the change log
• b2ea420 Remove hacky logo from docs
• a10a78b Update "What's New"
• 9f87630 Update the FAQ entries on compatibility and contributing
• f4a1f04 Docs: replace http links with https
• 30c525e Merge branch 'master' of https://github.com/PythonCharmers/python-future
• 70b36a8 Disable Python 2.6 CI tests for now
• Additional commits viewable in compare view

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[takluyver]

The futures package no longer seems to be used by any of our dependencies, so I'll update this to remove it from the constraints entirely.