GHSA-wwpr-jff3-395c - Crass: A large number of adjacent CSS comments can trigger a SystemStackError

### Impact When the `:preserve_comments` option is not enabled (which is the default behavior), Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a `SystemStackError`. ### Patches This is fixed in Crass 1.0.7, which no longer recurses when discarding comments. ### Workarounds Set the `:preserve_comments` option to `true` if this is acceptable to your use case (recursion doesn't occur when comments are preserved).