fido2: use exp/slices to support Go 1.18

sespiros · sespiros · commit 6af5dddfffdb · 2025-07-29T19:23:56.000+03:00
diff --git a/fido2/fido2.go b/fido2/fido2.go
@@ -23,7 +23,8 @@ import (
 	"errors"
 	"fmt"
 	"log"
-	"slices"
+
+	"golang.org/x/exp/slices"
 
 	"github.com/keys-pub/go-libfido2"
 	"github.com/snapcore/secboot"
