RPi.GPIO: Fix typo in name of ChangeFrequency method (#13634)

Author: aldonadi

stubs/RPi.GPIO/RPi/GPIO/__init__.pyi

@@ -62,5 +62,5 @@ class PWM:
     def __init__(self, channel: int, frequency: float, /) -> None: ...
     def start(self, dutycycle: float, /) -> None: ...
     def ChangeDutyCycle(self, dutycycle: float, /) -> None: ...
-    def ChangeFrequence(self, frequency: float, /) -> None: ...
+    def ChangeFrequency(self, frequency: float, /) -> None: ...
     def stop(self) -> None: ...