`slice out of range` when scanning on an arduino nano with ninafw 2.0.0

[mkantzer]

When scanning for bluetooth devices on an arduino nano running nina firmware version 2.0.0, we get a slice-out-of-range panic after a few devices are found:

found device: 90:E5:B1:41:5D:C6 -77 
found device: 71:F1:F1:BC:5C:F6 -67 
found device: 65:15:45:F2:82:FF -12 
found device: 90:E5:B1:67:11:5E -75 
panic: runtime error at 0x00007ecf: slice out of range
[tinygo: panic at <Go interface method>]