:bug: Use 64bit integers for file size metadata

[sergei-maertens]

32 bit limits you to roughly 2GB of files, which was not the intent.

The upstream open-zaak/open-zaak#1815 issue is required for this to work properly.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/woo_publications/publications/models.py	100.00% <100.00%> (ø)

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[bart-maykin]

@sergei-maertens because this issue is depended on that OZ issue, should I wait with reviewing this issue?