Add the Queen's Funeral to the list of UK bank holidays

[Wilsontomass]

Hi,
With the bank holiday announced it would be good to include this date in the list of holidays.

Best,
Tomass

[boring-cyborg]

Thanks for opening this pull request! It might take a while before we look at it, so don't worry if there seems to be no feedback. We'll get to it.

[CLAassistant]

All committers have signed the CLA.

[gbfredrik]

Resolves #1480 🙂

[coveralls]

Coverage increased (+0.0004%) to 71.15% when pulling d6f8262 on Wilsontomass:patch-1 into 3b462bc on lballabio:master.

[boring-cyborg]

Congratulations on your first merged pull request!

[tomwhoiscontrary]

Thanks @Wilsontomass!

[lballabio]

Also, a note: when using an earlier release, it's possible to update the calendar(s) manually with

UnitedKingdom(UnitedKingdom::Settlement).addHoliday(Date(19, September, 2022));
UnitedKingdom(UnitedKingdom::Exchange).addHoliday(Date(19, September, 2022));
UnitedKingdom(UnitedKingdom::Metals).addHoliday(Date(19, September, 2022));

The change will be propagated to all instances of the same calendar.