ZEO5: v↑ (5.2.0 -> 5.2.2)
5.2.2 brings in important fix that is needed for wendelin.core 2: https://github.com/zopefoundation/ZEO/pull/160
5.2.2 brings in important fix that is needed for wendelin.core 2: https://github.com/zopefoundation/ZEO/pull/160