Apply deprecation date rule for v5.1.9

Author: imodeljs-admin

common/config/eslint/eslint.config.deprecation-policy.js

@@ -23,7 +23,7 @@ module.exports = [
         "warn",
         {
           removeOldDates: true,
-          addVersion: "5.1.8"
+          addVersion: "5.1.9"
         }
       ]
     }