[FIX] calendar: do not create events past year 9999

datetime.date(year, month, day).weekday() is undefined for year > 9999.
When creating a google recurrent event that is set to never end,
Odoo tries to create 100 individual events.
If in Google calendar the user sets a recurring event to a custom interval,
of say a century, then the hundredth event is in 100x100 years, so in 12018.
Since 12018 > 9999, we get a traceback and synchronisation never happens.

opw 1845311

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