Getting "Implicitly marking parameter $externalId as nullable is deprecated" error when using PHP 8.4.5

[kurt-wasabi]

Hi.

Thanks for providing these slack-php tools.

I recently upgraded to PHP v8.4.5 and got an error when trying to post msgs using chatPostMessage().

Error message was:
SlackPhp\\BlockKit\\Kit::file(): Implicitly marking parameter $externalId as nullable is deprecated, the explicit nullable type must be used instead

I think the fix is to change line 123 in Kit.php from:
string $externalId = null,

to:
?string $externalId = null,

I realize this may only be one of many issues related to PHP v8.4.4 compatibility, but this is the one that I ran into.

Should I submit a Pull Request for the above?

[krb19xx]

Sorry, I messed up the PHP version in the first comment - I'm using PHP 8.4.5.

Hopefully you can change the title of the issue and the comment to make me look less dumb. :)

I went ahead and created a PR for this.

[maartenpaauw]

@krb19xx I've updated the title.

Off-topic: are both accounts associated with you?

[maartenpaauw]

Fixed in release 2.3.1

[krb19xx]

@krb19xx I've updated the title.

Off-topic: are both accounts associated with you?

Yes