Revert "make sure slice has the right size"

This reverts commit d152e458b9cb7251c9db5da2fb7203c408e5b71f.

Author: TheHippo

roaring.go

@@ -10,7 +10,6 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"slices"
 	"strconv"
 
 	"github.com/RoaringBitmap/roaring/v2/internal"
@@ -443,9 +442,6 @@ func (rb *Bitmap) toArray(array *[]uint32) *[]uint32 {
 // slice that is given to ToExistingArray. It is the callers duty to make sure the slice
 // has the right size.
 func (rb *Bitmap) ToExistingArray(array *[]uint32) *[]uint32 {
-	size := int(rb.GetCardinality())
-	*array = slices.Grow(*array, size)
-	*array = (*array)[:size]
 	return rb.toArray(array)
 }