fix: relax validation for timestamp and uri

[banteg]

What I did

fixes: #

How I did it

How to verify it

Checklist

• [ ] All changes are completed
• [ ] New test cases have been added
• [ ] Documentation has been updated

[antazoey]

I know it's been a while, but some context here would be helpful.

[fubuloubu]

I know it's been a while, but some context here would be helpful.

There's a lot of sloppy lists that are maintained by projects, and this library often raises issues with them instead of parsing. Anything that can be done to make them more successful would be helpful (maybe we should be testing against all the available lists from tokenlists.org)

[fubuloubu]

also looking at this library, it's rather old usages of Pydantic that I would love to upgrade to what we know is the latest