Update Github actions

[hughcars]

In some macos github action builds:

[build-and-test-macos (gcc, openmpi, openblas, static, int64, openmp, superlu, arpack)](https://github.com/awslabs/palace/actions/runs/11825573260/job/32994205616#step:4:17)
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Looks like the github action runners macos-latest-xl might've been moved to macos-latest-large. Should probably add an m1 build to the CI.

[phdum-a]

Everything looks good. Couple of minor suggestions but these are optional.

[phdum-a]

This line (new 175) might be better in the if clause above, although it does nothing if empty.

[phdum-a]

This looks ok — for this to trigger we need to not have defined the root paths (ARMPL|AOCL|MKL|OPENBLAS)(_DIR|ROOT|_ROOT). Then it will just call the default find lapack which will look for BLA_VENDOR.

The one question I had — do we want to treat the case specially where BLA_VENDOR is already set at the beginning of the script? Right now BLA_VENDOR is ignored or overwritten without warning/error, if even one of the root paths above is set. (e.g. if ARMPL_DIR is set in the environment and I set BLA_VENDOR=OpenBLAS I will not get OpenBLAS).

[hughcars]

I think this probably worth handling, but I'll do in a follow up PR (#299), as doing it neatly is going to involve a modest amount of refactoring in this file (in particular handling the AOCL section) and then a significant amount of testing for the edges.

[phdum-a]

Ok, but might suggest export OPENBLAS_DIR=$(brew --prefix openblas) for consistency with llvm on line 78.

[phdum-a]

Is there a recommendation from julia whether to also pin subversion (1.10 / 1.11)? I know these can have some breaking changes, although our usage might be light enough not to worry.

[hughcars]

I think I'd rather let it run along at 1 until there's a bug to prevent us otherwise. That way we'll naturally incorporate any updates. Our usage is very light anyway, so should be fine I think.