The `algorithms` argument is only ever tested with truthiness and the
`in` operator (it is stored verbatim as `self.allowed` on the JWS/JWE
registries), so a tuple, set, or frozenset works at runtime. Widen the
type hint from `list[str] | None` to `Collection[str] | None` across the
jwt/jws/jwe public APIs and the registry constructors, and add a
regression test covering list/tuple/set/frozenset.