Update jsonSerialize return type

[ajthinking]

Return type of Point jsonSerialize needs updating because:

PHP Deprecated: Return type of MStaack\LaravelPostgis\Geometries\Point::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/anders/Code/propertysearch/vendor/mstaack/laravel-postgis/src/Geometries/Point.php on line 103

Fixes #162

Let me know if this is good I can do the other types as well.

[shayneoneill]

Whats the status on this? Doesnt seem like its fixed.

[ajthinking]

Hi @shayneoneill, this was fixed in fork: https://github.com/ajthinking/laravel-postgis (v6.0.4)

See #163

[joelmellon]

@ajthinking Did you close this because you fixed this in your repo?

[ajthinking]

I think I closed it by accident. If you want feel free to reopen it.
But since #163 was merged prematurely without needed dependency upgrades I think this repo is now totally broken