Merge branch 'bugfix/suitesparse' into 'master'

Andreas Dednerrequested to merge
cherry-pick-2f45f8d0 into releases/2.9

[bugfix][SuiteSparse] Fix index type conversion problem.

See merge request !521 (merged)

(cherry picked from commit 2f45f8d0)

4c01ff41 [bugfix][SuiteSparse] Fix index type conversion problem.

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