Enable fix float point 2 decimal place

[aqibabas3]

What happened?

If the type is of type Float or Decimal (custom from https://github.com/shopspring/decimal) and the value have trailing zero, it will not show the trailing zero.
Eg 191.80 is showing as 191.8

What did you expect?

191.80 Supposed to show 191.80

Minimal graphql.schema and models to reproduce

even when implementing MarshalGQL (for decimal) doesnt work.

func (y Decimal) MarshalGQL(w io.Writer) {
fmt.Fprintf(w, decimal.Decimal(y).StringFixed(2))
}

versions

• go run github.com/99designs/gqlgen version?
  v0.17.45
• go version?
  1.21.5