chore: bump golangci-lint to v2.8

Author: tri-adam

.github/workflows/style.yaml

@@ -25,4 +25,4 @@ jobs:
           go-version: '~1.25.0'
       - uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.4
+          version: v2.8

pkg/mutate/squashfs_test.go

@@ -36,7 +36,8 @@ func testLayer(tb testing.TB, name string, digest v1.Hash) v1.Layer {
 func diffSquashFS(tb testing.TB, pathA, pathB string, diffArgs ...string) {
 	tb.Helper()
 
-	args := []string{"-a", pathA, "-b", pathB}
+	args := make([]string, 0, 4+len(diffArgs))
+	args = append(args, "-a", pathA, "-b", pathB)
 	args = append(args, diffArgs...)
 
 	cmd := exec.CommandContext(tb.Context(), "sqfsdiff", args...)