chore(renovate.json5): remove abandonment configuration for old PRs

Remove the configuration that automatically abandons old PRs after one year. This change is made to ensure that all PRs, regardless of age, are reviewed and closed manually. This helps in maintaining a clear record of all changes and decisions made in the repository.

Author: kzndotsh

.github/renovate.json5

@@ -23,12 +23,6 @@
   "dependencyDashboard": true,         // Enable dashboard for manual approvals
   "dependencyDashboardTitle": "Dependency Dashboard",
 
-  // Abandon old PRs after 1 year to keep things clean
-  "abandonments": {
-    "enabled": true,
-    "abandonmentThreshold": "1 year"
-  },
-
   // Security vulnerability handling - process immediately
   "vulnerabilityAlerts": {
     "enabled": true,