[releng] Issue #8619: Unretire python2-backports-functools_lru_cache

[Gwyn Ciesla]

limb reported a new issue against the project: `releng` that you are following:
``
Retired by mistake, still needed by python-matplotlib.

https://bugzilla.redhat.com/show_bug.cgi?id=1739925
``

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https://pagure.io/releng/issue/8619