🔧 chore(renovate): add version constraint for calibre-web

- add new package rule for linuxserver/calibre-web
- restrict updates to versions below 5 for current versions <=5

renovate.json

@@ -134,6 +134,11 @@
       "matchPackageNames": ["lobehub/lobe-chat-database", "lobehub/lobe-chat"],
       "groupName": "Lobe Chat"
     },
+    {
+      "matchPackageNames": ["linuxserver/calibre-web"],
+      "matchCurrentVersion": "<=5",
+      "allowedVersions": "<5"
+    },
     {
       "matchPackageNames": ["linuxserver/qbittorrent"],
       "matchCurrentVersion": "<=20",