rav1e: fix building after API break in rav1e
https://github.com/xiph/rav1e/commit/7791bb185bc333a605c6f6b9e8ccbfc713efb231 renamed Packet::number to Packet::input_frameno
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https://github.com/xiph/rav1e/commit/7791bb185bc333a605c6f6b9e8ccbfc713efb231 renamed Packet::number to Packet::input_frameno