testsuite: Use RGBA8 reference images

Due to a Mesa bug, RGBA16 images aren't properly handled sometimes and
can cause random failures.
In this case, generating the modified reference images for the tests
fails.

Fixes CI breakage.

Related: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11750
This commit is contained in:
Benjamin Otte 2024-09-24 13:02:16 +02:00 committed by Benjamin Otte
parent fb73040d70
commit feeca98270

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