Use link to sqlx repo instead of fork

[kurotych]

• Use the official SQLx repository link instead of the fork. It makes future updates a little bit easier and more transparent and we don't have to host fork in our repo.
• Remove the unused helium-crypto dependency from boost_manager.

Updating SQLx further is currently impossible due to package conflicts, mainly because we are using an outdated Solana library.
Upgrading solana-client, solana-sdk, and solana-program to version ^2 could theoretically resolve these conflicts.

[jeffgrunewald]

Wow, did we really fork this and not make any changes instead of just pinning the original repo? Wild

[kurotych]

Wow, did we really fork this and not make any changes instead of just pinning the original repo? Wild

It looks like. I think it was for the time we were waiting the changes in launchbadge/sqlx@42dd78f to be accepted into main branch.