refactor(stdlib): replace deprecated functions with Go 1.26 equivalents

Replace sort.Strings with slices.Sort (Go 1.21+) for generic type-safe
sorting and filepath.Walk with filepath.WalkDir (Go 1.16+) for improved
performance by avoiding extra stat calls.

- lib/fetch.go: replace sort.Strings with slices.Sort
- internal/builder/libraries.go: replace filepath.Walk with
  filepath.WalkDir

Signed-off-by: Martin Wimpress <code@wimpress.io>

Author: flexiondotorg

internal/builder/libraries.go

@@ -907,11 +907,11 @@ func touchAutomakeFiles(srcPath string) error {
 	}
 
 	// Also touch any Makefile.in files in subdirectories
-	filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+	filepath.WalkDir(srcPath, func(path string, d os.DirEntry, err error) error {
 		if err != nil {
 			return err
 		}
-		if !info.IsDir() && info.Name() == "Makefile.in" {
+		if !d.IsDir() && d.Name() == "Makefile.in" {
 			os.Chtimes(path, now, now)
 		}
 		return nil

lib/fetch.go

@@ -12,7 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
-	"sort"
+	"slices"
 	"strings"
 )
 
@@ -161,7 +161,7 @@ func findViaAPI(prefix string) (string, error) {
 	}
 
 	// Sort to find highest version (lib-8.0.0.0 < lib-8.0.0.1 < lib-8.0.0.3)
-	sort.Strings(matchingReleases)
+	slices.Sort(matchingReleases)
 
 	// Return the last (highest) version
 	return matchingReleases[len(matchingReleases)-1], nil