We upgraded our minimum Go version to 1.21 in commit
57ac9c2189458a7f0e63c2e9cac8334694a3d545. We can now replace our
`utils.Min` and `utils.Max` functions with the built-in `min` and `max`.
Reference: https://go.dev/ref/spec#Min_and_max
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>