Wrong data reported from Pypi API

[TG1999]

Describe the bug
The pypi API tells that cryptography@37.0.2 has no dependency https://pypi.org/pypi/cryptography/37.0.2/json, (requires-dist is null) but in the METADATA file it is found that it has a dependency Requires-Dist: cffi (>=1.12)

Expected behavior
requires-dist in the API should report same dependency as in METADATA

To Reproduce
Download wheel for cryptography@37.0.2 and check the METADATA file you can find this Requires-Dist: cffi (>=1.12)
https://pypi.org/pypi/cryptography/37.0.2/json the requires-dist is null

[miketheman]

Current behavior is a result of upload-time metadata, see: https://warehouse.pypa.io/api-reference/json.html#get--pypi--project_name--json:~:text=Metadata%20returned%20comes%20from%20the%20values%20provided%20at%20upload%20time%20and%20does%20not%20necessarily%20match%20the%20content%20of%20the%20uploaded%20files.

Related to #474 and #8090

[dstufft]

Closing as a duplicate to #474