Test dev versions of libcxx

[jdblischak]

Recently in #125 we had to pin libcxx <18 in order to avoid an Illegal instruction error on osx-64. Other conda-forge maintainers have been uploading experimental versions of libcxx to the channel conda-forge/label/libcxx_dev. This PR tests the latest dev version of libcxx for TileDB-VCF.

xref: conda-forge/libcxx-feedstock#162, conda-forge/libcxx-feedstock#168, conda-forge/libcxx-feedstock#167, conda-forge/arcticdb-feedstock#251

[jdblischak]

Still failing with the same runtime error during the osx-64 tests:

+ bash test-cli.sh
test-cli.sh: line 11: 16371 Illegal instruction: 4  tiledbvcf export --uri s3://tiledb-inc-demo-data/tiledbvcf-arrays/v4/vcf-samples-20 --regions chr1:1-100000 --sample-names v2-usVwJUmo,v2-WpXCYApL --output-format z --output-dir "$OUTDIR"
WARNING: Tests failed for libtiledbvcf-0.33.3-hfffce77_1.conda - moving package to /Users/runner/miniforge3/conda-bld/broken
TESTS FAILED: libtiledbvcf-0.33.3-hfffce77_1.conda

This build used libcxx 18.1.8-h27c2254_5 from conda-forge/label/libcxx_dev

[h-vetinari]

Thanks for testing! Yeah, unfortunately the errors persisted also for arcticdb...

[jdblischak]

Superseded by #136