heifsave: ensure true lossless with libheif < v1.17.2 #4057
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In accordance with commit strukturag/libheif@136cf01.
However, it still requires libheif >= 1.13.0 for true lossless, so update
test_avifsave_lossless
accordingly to fix CI on the 8.15 branch (which still uses Ubuntu 22.04 as the runner image).Targets the 8.15 branch.