refactor: use slices package for sort (#10132)

The sort package is still used in places that were not trivial to
change. Since Go 1.21 slices package can be uswed for sort. See
https://go.dev/doc/go1.21#slices

### Purpose

Make some progress with the migration to a more up-to-date syntax.

lib/versioner/util.go

@@ -13,7 +13,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"sort"
+	"slices"
 	"strings"
 	"time"
 
@@ -339,7 +339,7 @@ func findAllVersions(fs fs.Filesystem, filePath string) []string {
 		return nil
 	}
 	versions = stringutil.UniqueTrimmedStrings(versions)
-	sort.Strings(versions)
+	slices.Sort(versions)
 
 	return versions
 }