Mark the `paintJpegXObject` operator as deprecated (PR 11601 follow-up)
Mark the `paintJpegXObject` operator as deprecated (PR 11601 follow-up)

After PR 11601, the `paintJpegXObject` operator is no longer used for anything. While I don't think we can just remove it, and essentially leave a "hole" in the `OPS` structure, we should at least mark it as explicitly unused to aid readability/maintainability of the code.

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