The year is not parsed correctly in Russian localization with CustomParseFormat

**Describe the bug**
When a date is parsed from text starting from the month of December, the year is parsed as +1 to the year.
```
import dayjs from "dayjs";
import customParseFormat from 'dayjs/plugin/customParseFormat';
import "dayjs/locale/ru";

dayjs.extend(customParseFormat);

console.log(dayjs("01 декабря 2024", "DD MMMM YYYY", 'ru').year()); // 2025
```

**Expected behavior**
The year should be parsed correct:
```
console.log(dayjs("01 декабря 2024", "DD MMMM YYYY", 'ru').year()); // 2024
```

**Information**
- Day.js Version: 1.11.13
- OS: Windows
- Browser: Edge 129.0.2792.79
- Time zone: GMT+3

Start by running the provided CustomParseFormat example with the Russian locale and inspect the customParseFormat plugin together with dayjs/locale/ru. The fix is complete when parsing "01 декабря 2024" with "DD MMMM YYYY" returns year 2024 rather than 2025.

Written by the indexing model from the issue text.