chore: don't rate limit lock file upgrades

.gitlab/renovate.json

@@ -20,6 +20,11 @@
       "additionalBranchPrefix": "{{parentDir}}-",
       "semanticCommitScope": "{{parentDir}}"
     },
+    {
+      "matchUpdateTypes": ["lockFileMaintenance"],
+      "branchConcurrentLimit": 0,
+      "prConcurrentLimit": 0
+    },
     {
       "matchUpdateTypes": ["major", "minor"],
       "matchBaseBranches": ["stable"],