error in _parse_shake_report wrong bit mask

Noticed a typo for the shake report. In the SH-2 doc (6.5.32 page 78) it shows the lower 3 bit contain the x,y,z status bits. but the bit mask here has 0x111, it should be 0b111 or likely clearer for a " bool:
shake_bitfield = unpack_from(" 0
```

I don't have CircuitPython, so I don't have any way to test, so I won't do a pull request. What I believe will fix it:
```
def _parse_shake_report(report_bytes: bytearray) -> bool:
shake_bitfield = unpack_from(" 0
```

Start in __init__.py around line 302 and compare _parse_shake_report with the SH-2 documentation, section 6.5.32 page 78. Confirm that the mask checks the lower three status bits, then run any available project tests or validation for the BNO08x library. Done means the mask matches the documented bitfield and existing behavior remains covered.

Written by the indexing model from the issue text.