Gatekeeper Integration API : Pin numpy package to version 1.26.4

[codingbandit]

Gatekeeper Integration API : Pin numpy package to version 1.26.4

Details on the issue fix or feature implementation

An update to numpy to v. 2 created a downstream package incompatibility with the Thinc package (breaking Presidio). Pinning version to 1.26.4 fixes this issue until the downstream problems are rectified.

Ref:
microsoft/presidio#1400
explosion/thinc#939

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• I have updated relevant docs, where applicable

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