[pull] master from php:master - #1272
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…reference insertBefore($n, $n) unlinked the node, then rebuilt its position from the pointers the unlink had just cleared, leaving it out of the document with a self-referencing sibling list, freed twice at teardown. Retarget the reference to the node's next sibling, as the modern DOM already does. Close GH-23379
* PHP-8.4: Fix GH-23365: DOMNode::insertBefore() drops the node used as its own reference
* PHP-8.5: Fix GH-23365: DOMNode::insertBefore() drops the node used as its own reference
This is only ever written to, but never read, and since this is static, no other translation unit or module can access this too.
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