Upgrade pelago/emogrifier dependency

[samandeggs]

Hi - Having issues if trying to use PHP 8.3, as pelago/emogrifier 6.0.0 requires a maximum of php8.1.0 - presumably this could be part of a SS5 upgrade, doubt there's much here to make it SS5 compatible other than this conflict to allow for php8.3 support.

[samandeggs]

@lekoala actually, likely requires a full dependency update to support SS5 - would be greatly appreciated

[lekoala]

actually, silverstripe 5 requires a whole other setup since it's using another mailer, see
#14

Adjusting for pelago/emogrifier should be easy enough, i could even make that dependecy optional or set ^6|^7 if that works

[samandeggs]

It may I'm not entirely sure. If you think that there are bigger issues at play here with SS5 not being supported, that was the ultimate goal with beating this issue. Happy to test it out if you do make that alteration.

Thanks for your time.

[lekoala]

i changed it to ^6|^7 on master at least installing should work fine