Fix StackOverflowError with matrix exp on 1.7.0-rc2 (fix #43008) #43013
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Cherry-picked 2 commits to fix #43008
(StackOverflowError when taking complex-valued matrix exp, bumping openblas for a fix)
Hope it's the correct way to do this. Likely need to have the 1.7 tag/backport?
just picking b8ad4f1 does not seem enough, thus also added 6d0b192
5a14037 not included here for now: openblas is usually downloaded, but for cases where it needs to be built from source maybe this mk file needs to be included for consistency