Set Go toolchain to v1.26.1 and apply modernizations (#138)

This change makes sure that we use the latest Go version when building
and applies some modernization fixes.

test/utils/utils.go

@@ -153,8 +153,8 @@ func LoadImageToKindClusterWithName(name string) error {
 // according to line breakers, and ignores the empty elements in it.
 func GetNonEmptyLines(output string) []string {
 	var res []string
-	elements := strings.Split(output, "\n")
-	for _, element := range elements {
+	elements := strings.SplitSeq(output, "\n")
+	for element := range elements {
 		if element != "" {
 			res = append(res, element)
 		}