chrono/ru: half year doesn't add anything

[apogay37]

const chrono = require('chrono-node/ru');

console.log(new Date); // 2025-04-22T07:53:38.314Z
console.log(chrono.parseDate('через пол часа')); // 2025-04-22T08:23:38.324Z <-- added 30 minutes
console.log(chrono.parseDate('через пол года')); // 2025-04-22T07:53:38.432Z <-- did not add anything

"через пол часа" (in half hour) adds 30 minutes
"через пол года" (in half year) does not add anything at all