Duration not rounded if timing file is updated

[SamuelWei]

Today I added cypress-split to my Github Action. I works great, however I believe there is a small bug.

If the duration of tests change, the timings.json file is updated.
The only issue is, that the new duration is not a rounded value, but instead has a lot of decimal places.

In the CI run output the values are rounded.

The values where also rounded when the CI created the timings.json file on the first run.