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Last time I checked, the Servo library doesn't even use PWM properly (just timer-triggered digitalWrite), so you should be able to use basically any digital pin that isn't being used for something else.
If you want to use a different library that does use PWM timers properly, you can check the Uno pinout to see which pins have which features - although it'd behoove you to avoid pins 5 & 6 since they're hooked to Timer0 which is used for delay() and millis() by default.
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