12CDisplay moved in CircuitPython 10

[shshaw]

Finally got my PicoStepSeq built and working! Great little project.

Used CircuitPython 10 with it, which overall is fine, but I2CDisplay has moved. CircuitPython 9 kept a reference to it in displayio, but you have to use i2cdisplaybus in 10.

In sequencer_hardware.py:
display_bus = displayio.I2CDisplay(oled_i2c, device_address=0x3C)
needs to be
display_bus = i2cdisplaybus.I2CDisplayBus(oled_i2c, device_address=0x3C)