Revert update of hiredis in Poetry lockfile: revert from 2.1.0 to 2.0.0. (#14718)

* Revert "Bump hiredis from 2.0.0 to 2.1.0 (#14699)"

This reverts commit 9c89707b.

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

changelog.d/14699.misc

-Bump hiredis from 2.0.0 to 2.1.0.

changelog.d/14718.misc

+Revert update of hiredis in Poetry lockfile: revert from 2.1.0 to 2.0.0.
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