Merge branch 'fix/material-spline-law' into 'master'

Timo Kochrequested to merge
cherry-pick-9a163f67 into releases/3.3

[material][spline] Fix compiler error gcc

See merge request !2466 (merged)

(cherry picked from commit 9a163f67)

cf249782 [material][spline] Make lambda non-generic ea818ead [spline] Use less auto where the type is clear to unconfuse compiler

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