pc.subtract_checked(x, x) with x as pa.array((1, 2, 3, 4, 5), type=pa.decimal128(38, 19)) raises "Decimal precision out of range"

### Describe the bug, including details regarding any error messages, version, and platform.

### Code
```python
import pyarrow as pa
import pyarrow.compute as pc

x = pa.array((1, 2, 3, 4, 5), type=pa.decimal128(38, 19))
print(
pc.subtract_checked(x, x)
) # ArrowInvalid: Decimal precision out of range [1, 38]: 39
```

### Component(s)

Python

### Environment

python == 3.13.7
pyarrow == 21.0.0
os == "Ubuntu 24.04.3 LTS"
cpu == "AMD Ryzen™ 5 5600H with Radeon™ Graphics × 12"