flv/rav1e: Use a specific git commit of flavors/rav1e dependencies to continue...

flv/rav1e: Use a specific git commit of flavors/rav1e dependencies to continue working with older versions
5 jobs for flavors-0.5 in 17 minutes and 58 seconds (queued for 9 seconds)
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test 1.34 Test
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test nightly Test
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