If it were brakes, you would only hear squeeking when you apply the brakes
So if it is constant:
with soft squeeking, it could be tire pressure, low tire pressure can cause a high pitched sound
Bearings give you more of a grinding sound along with some vibration in the steering wheel - if you are also feeling something in the wheel then it would be more of a clue
check tire pressure, inspect fron brake rotors for grooves, have front wheel bearings inspected and re-packed with grease - all 3 are not expensive to do
lastly, inspect under the car for debris - you may have picked up trash or other item and its stuck under the car and dragging - see if you can get outside the car and have a friend drive around the driveway and see if you can tell where the sound is coming from and repost question if necc.