Does this package need to be pinned to astropy v6?

Currently, in pyproject.toml, this package is pinned to astropy v6 with:

astropy = "^6.0"

Can this be relaxed so that astropy v7 is also allowable?

This requirement is breaking several conda-forge package upgrades via pesummary's dependency on ligo.em-bright, e.g., https://github.com/conda-forge/pesummary-feedstock/pull/63, https://github.com/conda-forge/bilby_pipe-feedstock/pull/48, https://github.com/conda-forge/cwinpy-feedstock/pull/54.

Another option would be for pesummary to have a conda-forge package (e.g., pesummary-base) that does not have the "extra"'s (which include ligo.em-bright) as a requirement. This would probably be a better solution.

cc @duncanmmacleod @charlie.hoy

@matthew-pitkin I don't think it needs to be pinned to a specific version of astropy. This is probably a remnant of the initial poetry scaffolding.

mentioned in commit 49ab974a