Make most of the fields in KeyinfoPubkey and KeyinfoSslcert models optional

[dmach]

Fixes: #1596

[pep8speaks]

Hello @dmach! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file tests/test_keyinfo.py:

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Comment last updated at 2024-07-04 12:25:13 UTC