python requirements: bump protobuf version to match 7494535

[efd6]

Proposed commit message

The change in 7494535 did not update these requirements, resulting in inconsistent requirements and doc check failure:

ERROR: Cannot install protobuf==3.19.4 and protobuf==3.19.5 because these package versions have conflicting dependencies.

ref:https://github.com/elastic/beats/actions/runs/7603570651/job/20705471856?pr=37682

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[efd6]

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[efd6]

Abandoned for #37711.