ci/broadcom: move the rpi4 depthstencil-default_fb-drawpixels fails into flakes
Spotted here (only one, but I assume by the structure of fails and flakes it will apply for other testcases): https://gitlab.freedesktop.org/mesa/mesa/-/jobs/35192025
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Spotted here (only one, but I assume by the structure of fails and flakes it will apply for other testcases): https://gitlab.freedesktop.org/mesa/mesa/-/jobs/35192025