GHSA-93R5-FHX6-VMG9 xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartPart` re-scan and `normalize()` adjacent-text merge

Summary xmldom's malformed-input error-recovery path has two quadratic-time On² behaviors that a single crafted input triggers together, so a tiny, highly compressible document tens of KB stalls the Node.js event loop for multiple seconds. It is reachable from DOMParser.parseFromString under...