Increase the ruleset size to 16 bits (#23586)

## Summary

There are currently 960 rules and no room for more. This raises the
limit to 1024.

## Test Plan

Ran the `configuration::tests::select_two_char_prefix` test after adding
one extra rule.

Author: Dev-iL

crates/ruff_linter/src/registry/rule_set.rs

@@ -5,7 +5,7 @@ use ruff_macros::CacheKey;
 
 use crate::registry::Rule;
 
-const RULESET_SIZE: usize = 15;
+const RULESET_SIZE: usize = 16;
 
 /// A set of [`Rule`]s.
 ///