Replace min/max helpers with built-in min/max

We upgraded our minimum Go version to 1.21 in commit
57ac9c2189. 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>

pkg/utils/utils_test.go

@@ -6,37 +6,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-// TestMin is a function.
-func TestMin(t *testing.T) {
-	type scenario struct {
-		a        int
-		b        int
-		expected int
-	}
-
-	scenarios := []scenario{
-		{
-			1,
-			1,
-			1,
-		},
-		{
-			1,
-			2,
-			1,
-		},
-		{
-			2,
-			1,
-			1,
-		},
-	}
-
-	for _, s := range scenarios {
-		assert.EqualValues(t, s.expected, Min(s.a, s.b))
-	}
-}
-
 func TestAsJson(t *testing.T) {
 	type myStruct struct {
 		a string