Fix a reportUnnecessaryIsInstance Pyright warning (archlinux#4263)

Author: correctmost

archinstall/lib/models/device.py

@@ -317,10 +317,6 @@ class Size:
 	unit: Unit
 	sector_size: SectorSize
 
-	def __post_init__(self) -> None:
-		if not isinstance(self.sector_size, SectorSize):
-			raise ValueError('sector size must be of type SectorSize')
-
 	def json(self) -> _SizeSerialization:
 		return {
 			'value': self.value,