fix: Fix clip for Decimal returning wrong values

[lukemanley]

import polars as pl
from decimal import Decimal as D

df = pl.Series("a", ["1.1", "2.2", "3.3"], pl.Decimal(21, 1)).to_frame()

df.select(
    pl.col("a").clip(lower_bound=D("1.5"), upper_bound=D("2.5"))
)

BEFORE:

shape: (3, 1)
┌───────────────┐
│ a             │
│ ---           │
│ decimal[21,1] │
╞═══════════════╡
│ 15.0          │
│ 22.0          │
│ 25.0          │
└───────────────┘

AFTER:

shape: (3, 1)
┌───────────────┐
│ a             │
│ ---           │
│ decimal[21,1] │
╞═══════════════╡
│ 1.5           │
│ 2.2           │
│ 2.5           │
└───────────────┘

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.63%. Comparing base (099ee3c) to head (5453119).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20814   +/-   ##
=======================================
  Coverage   79.63%   79.63%           
=======================================
  Files        1568     1568           
  Lines      222970   222958   -12     
  Branches     2544     2544           
=======================================
- Hits       177555   177551    -4     
+ Misses      44831    44823    -8     
  Partials      584      584           

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[ritchie46]

Thanks a lot @lukemanley 🙌