[pre-commit.ci] auto fixes from pre-commit.com hooks

Author: pre-commit-ci[bot]

stdlib/_operator.pyi

@@ -264,7 +264,7 @@ def setitem(a: MutableMapping[_K, _V], b: _K, c: _V, /) -> None: ...
 def length_hint(obj: object, default: int = 0, /) -> int: ...
 def iadd(a: _SupportsIAdd[_T_contra, _T_co], b: _T_contra, /) -> _T_co: ...
 def iand(a: _SupportsIAnd[_T_contra, _T_co], b: _T_contra, /) -> _T_co: ...
-def iconcat(a: MutableSequence[_T], b: Sequence[_T], /) -> MutableSequence[_T]: ... # currently impossible to type more precisely
+def iconcat(a: MutableSequence[_T], b: Sequence[_T], /) -> MutableSequence[_T]: ...  # currently impossible to type more precisely
 def ifloordiv(a: _SupportsIFloorDiv[_T_contra, _T_co], b: _T_contra, /) -> _T_co: ...
 def ilshift(a: _SupportsILShift[_T_contra, _T_co], b: _T_contra, /) -> _T_co: ...
 def imod(a: _SupportsIMod[_T_contra, _T_co], b: _T_contra, /) -> _T_co: ...