[Python] Blender API Question - rotation about center of object

I am running the following code. I would like to rotate the selected blocks about the x-axis in the center. However, it is rotating about the corner. Can I ask for assistance?

import bpy
from mathutils import Matrix, Vector
import math

angle = math.radians(45)


for obj in bpy.data.objects:

if(obj.location.x > 1.1):
obj.select_set(True)
print(obj.location.x)
bpy.context.view_layer.objects.active = obj



bpy.ops.transform.rotate(value=math.radians(90) , orient_axis='X')
print("hello33")




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