Small adjustments to recent/future changes in LinAlg.jl

[dkarrasch]

Starting from Julia v1.9, axpy! is owned by LinearAlgebra, and BLAS.axpy! does no longer work for non-strided arrays. Also, in the future AbstractQ will no longer subtype AbstractMatrix, so in tests we need to convert to Matrix manually.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@bd54341). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

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