Fix type hints

Author: notatallshaw

src/resolvelib/resolvers.py

@@ -9,12 +9,9 @@
     Collection,
     Generic,
     Iterable,
-    List,
     Mapping,
     NamedTuple,
     Optional,
-    Set,
-    Tuple,
 )
 
 from .providers import AbstractProvider
@@ -279,7 +276,7 @@ def _attempt_to_pin_criterion(self, name: KT) -> list[Criterion[RT, CT]]:
         # end, signal for backtracking.
         return causes
 
-    def _backtrack_iteration(self) -> Tuple[KT, CT, List[Tuple[KT, list[CT]]]]:
+    def _backtrack_iteration(self) -> tuple[KT, CT, list[tuple[KT, list[CT]]]]:
         broken_state = self._states.pop()
         name, candidate = broken_state.mapping.popitem()
         incompatibilities_from_broken = [
@@ -292,8 +289,8 @@ def _backtrack_iteration(self) -> Tuple[KT, CT, List[Tuple[KT, list[CT]]]]:
     def _backjump_iteration(
         self,
         causes: list[RequirementInformation[RT, CT]],
-        incompatible_deps: Set[KT],
-    ) -> Tuple[KT, CT, List[Tuple[KT, list[CT]]]]:
+        incompatible_deps: set[KT],
+    ) -> tuple[KT, CT, list[tuple[KT, list[CT]]]]:
         # Ensure to backtrack to a state that caused the incompatibility
         incompatible_state = False
         name, candidate, broken_state = None, None, None