PHP 8.5 deprecation warnings

[dregad]

I'm getting the following errors running on PHP 8.5.6:

Deprecated: Using null as an array offset is deprecated, use an empty string instead in .../StorageAdapter/Session.php on line 45
Deprecated: Using null as an array offset is deprecated, use an empty string instead in .../StorageAdapter/Session.php on line 46

Deprecated: Function imagedestroy() is deprecated since 8.5, as it has no effect since PHP 8.0 in ...e/securimage.php on line 2169