Adjust licence check to match new requirements

[kre9]

Since certain CC Licences are now allowed to be used (e.g. with citestyles in our case) the licence check does not work correctly anymore.

The is_osi_approved function at src/check/manifest.rs:530 is throwing the error.

Reference to the changes in the packages repo:
typst/packages#1511
typst/packages#1521