Merge branch 'cleanup/flash-depr-warn' into 'master'

Kilian Weishauptrequested to merge
cherry-pick-72e5854d into releases/3.3

[test][material][compositionalflash] Remove deprecation warning by using new interface

Closes #963 (closed)

See merge request !2381 (merged)

(cherry picked from commit 72e5854d)

bd59e93e [test][material][compositionalflash] Remove deprecation warning by using new interface

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