Merge branch 'upgrade-doc-refs' into 'main'

docs: use renovate to upgrade refs in markdown

See merge request gitlab-com/gl-infra/common-ci-tasks!42

renovate.json

 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "reviewersFromCodeOwners": true
+  "extends": [
+    "config:base",
+    ":disableDependencyDashboard"
+  ],
+  "reviewersFromCodeOwners": true,
+  "addLabels": [
+    "type::maintenance",
+    "maintenance::dependency"
+  ],
+  "rebaseWhen": "behind-base-branch",
+  "vulnerabilityAlerts": {
+    "enabled": true,
+    "addLabels": [
+      "security"
+    ],
+    "schedule": [
+      "at any time"
+    ]
+  },
+  "regexManagers": [
+    {
+      "fileMatch": [
+        ".*\\.md$"
+      ],
+      "matchStrings": [
+        "ref: (?<currentValue>[^ ]*?) # renovate:managed"
+      ],
+      "depNameTemplate": "gitlab-com/gl-infra/common-ci-tasks",
+      "datasourceTemplate": "gitlab-tags"
+    }
+  ]
 }