chore(deps): update actions/checkout action to v6

renovate.json

@@ -44,7 +44,8 @@
     ],
     "vulnerabilityAlerts": {
       "labels": ["security", "vulnerability"],
-      "schedule": ["at any time"]
+      "schedule": ["at any time"],
+      "prPriority": 10
     },
     "lockFileMaintenance": {
       "enabled": true,