PHP 8.3 allows class constants to have type hints

It's 2023

It's 2023

It is 2022 - update copyright dates

Canada census 3 (#3936)

* Added 3 years of Canada Census formats

* Added tests for Canadian census data

* Fixed month-day order and moved Canadian to bottom of default

* a bit of cleanup to

Canada census 3 (#3936)

* Added 3 years of Canada Census formats

* Added tests for Canadian census data

* Fixed month-day order and moved Canadian to bottom of default

* a bit of cleanup to the spacing, and comments

* Fix style for spacing

* 5 more years of Canadian census documents

* Corrected cp artifact in original file version

* Adjusted date of 1851 Canada census to be in 1851

* Fixed <tab> vs space

* typo

* Adapted to comments

* Removed change in Age.php, per comments

* restored AgeTest

* small clean up, spacing and some comments

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