[stable34] fix(repair): restrict unserialize() in RemoveBrokenProperties#61203
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RemoveBrokenProperties::run() calls unserialize() on the property value column without restricting allowed_classes. The result is only compared against false to identify broken rows, so no class instantiation is needed. As written though, magic methods (__wakeup/__destruct) on any class referenced by the serialized payload still execute. The runtime decoder for the same column already restricts deserialization. See apps/dav/lib/DAV/CustomPropertiesBackend.php:675-678, which passes ['allowed_classes' => self::ALLOWED_SERIALIZED_CLASSES]. This change applies the same hardening to the repair step. It uses ['allowed_classes' => false] since the unserialized value is never used, only its truthiness is checked. No behavior change for valid or broken rows. Signed-off-by: Eli Peter <54954007+elicpeter@users.noreply.github.com>
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Backport of PR #59979