Update Renovate config with pip requirements rules

Adds package rules to target pip_requirements manager for files in requirements/*.txt and enables assignees from CODEOWNERS. This improves automation and assignment for dependency updates.

Author: Lulalaby

renovate.json

@@ -4,5 +4,16 @@
     "local>Pycord-Development/renovate-config",
     ":semanticPrefixFixDepsChoreOthers",
     ":dependencyDashboard"
+  ],
+  "assigneesFromCodeOwners": true,
+  "packageRules": [
+    {
+      "matchManagers": [
+        "pip_requirements"
+      ],
+      "matchPaths": [
+        "requirements/*.txt"
+      ]
+    }
   ]
-}
+}