Fix patroni no longer working with update to ydiff 1.3
What does this MR do and why?
This backports !7535 (merged) to 16-10-stable.
ydiff 1.3.0 was released on April 2, 2024 (https://pypi.org/project/ydiff/#history), and the patroni install quietly updated to ydiff 1.3.0 from 1.2.0.
https://github.com/zalando/patroni/blob/v3.0.1/requirements.txt#L15 allows any version of ydiff above 1.2.0, but as described in https://github.com/zalando/patroni/blob/634b44ee0586f063033074806a42b534a354cbff/docs/releases.rst#L16 ydiff 1.3 requires the cdiff module.
To fix this problem, pin the version of ydiff to 1.2.0 until we can upgrade patroni.
Related issues
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