Update apache-libcloud requirement from <3,>=2.2.1 to >=2.2.1,<4

[dependabot]

Updates the requirements on apache-libcloud to permit the latest version.

Changelog

Sourced from apache-libcloud's changelog.

Changes in Apache Libcloud 3.4.1

.. note::

Libcloud depends on the requests library for performing HTTP(s) requests.

Prior to requests v2.26.0, requests depended on chardet library which is licensed under LGPL (requests library itself is licensed under the Apache License 2.0 license).

Since Libcloud is not an application, but a library which is usually used along many other libraries in the same (virtual) environment, we can't have a strict dependency on requests >= 2.26.0 since that would break a lot of installations where users already depend on and have an older version of requests installed.

If you are using requests < 2.26.0 along the Libcloud library you are using version of chardet library (chardet is a direct dependency of the requests library) which license is not compatible with Apache Libcloud.

If using a LGPL dependency is a problem for your application, you should ensure you are using requests >= 2.26.0.

It's also worth noting that Apache Libcloud doesn't bundle any 3rd party dependencies with our release artifacts - we only provide source code artifacts on our website.

When installing Libcloud from PyPi using pip, pip will also download and use the latest version of requests without the problematic chardet dependency, unless you already have older version of the requests library installed in the same environment where you also want to use Libcloud - in that case, Libcloud will use the dependency which is already available and installed.

Common

- Fix a regression which was inadvertently introduced in v3.4.0 which prevented
  users from installing Libcloud under Python 3.5.
Also revert requests minimum version required change and relax the
minimum version requirement.
Previous change would prevent Libcloud from being installed in environments
where a conflicting (lower) version of requests library is required and
already installed.
As a library and not an application, Libcloud should specify as loose
requirements as possible to prevent issues with conflicting requirements
versions which could prevent Libcloud from being installed.
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Commits

• 28d3785 Add a workaround for more-itertools upstream change which broke tests
• eff80c0 Bump version for v3.4.1 release.
• 2c1fcdf Enable CI for 3.4.x series branch.
• 5f5b509 Use include.
• 14e90fb Add a note on chardet LGPL issue to the upgrade notes and changelog.
• 90d7ec0 Update changelog.
• e0726c8 Add changelog entry.
• edfb4c5 Don't require the very latest version of requests under Python >= 3.6.
• dfa5673 Fix a bug in setup.py which causes installation to fail under Python 3.5
• ab4069a Re-generate provider tables.
• Additional commits viewable in compare view

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