[BUG] cast(10.05 as decimal(38,18)), actual: 10.050000000000001000, expected: 10.05

[ttnghia]

When running the changes in #10917 on org.apache.spark.sql.rapids.suites.RapidsCastSuite, the previous failed test (cast(10.3 as decimal(38,18))) now passes, however, a new failure shows up:

- casting to fixed-precision decimals *** FAILED ***
  Incorrect evaluation: cast(10.05 as decimal(38,18)), actual: 10.050000000000001000, expected: 10.05