Remove old dependency on x/exp/slices in favor of stdlib

go.mod

@@ -1,5 +1,5 @@
 module go.elara.ws/vercmp
 
-go 1.20
+go 1.21
 
 require golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1

vercmp.go

@@ -3,10 +3,9 @@
 package vercmp
 
 import (
+	"slices"
 	"strconv"
 	"strings"
-
-	"golang.org/x/exp/slices"
 )
 
 // Compare compares two version strings.

vercmp_test.go

@@ -1,9 +1,8 @@
 package vercmp
 
 import (
+	"slices"
 	"testing"
-
-	"golang.org/x/exp/slices"
 )
 
 func TestSepLabel(t *testing.T) {