ARROW-11472: [Python][CI] Temporary pin numpy on kartothek integration builds
ARROW-11472: [Python][CI] Temporary pin numpy on kartothek integration builds

Closes #9396 from jorisvandenbossche/ARROW-11472-kartothek-pin-numpy

Authored-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>
Signed-off-by: Uwe L. Korn <5f6f0a63dee51498bdd8036770b3bad30ce7a5ac@quantco.com>

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