bump glue-astronomy to 0.7, max pin ipywidgets

[kecnry]

Description

This pull request bumps the minimum version of glue-astronomy to 0.7 to get updates to units that prevents an error in specviz when loading multiple spectra.

Change log entry

• Is a change log needed? If yes, is it added to CHANGES.rst? If you want to avoid merge conflicts,
  list the proposed change log here for review and add to CHANGES.rst before merge. If no, maintainer
  should add a no-changelog-entry-needed label.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a milestone set? Set this to bugfix milestone if this is a bug fix and needs to be released ASAP; otherwise, set this to the next major release milestone.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[pllim]

Maybe we need a new CI job to test against oldest supported dependencies but that is a battle for another day... Thanks!

[pllim]

LoL wut? NotImplementedError: Cannot

[rosteen]

Oh no, I thought that error would be unique to #2104 but I guess not 😬

[pllim]

I opened upstream issue at jupyter-widgets/ipywidgets#3729 . For now, I think we need to max pin ipywidgets to 8.0.4

[pllim]

ipywidgets dev suggested a simple workaround: jupyter-widgets/ipywidgets#3729 (comment)

[rosteen]

We might need to add that import to every affected test file 😬

[pllim]

import to every affected test file

That sounds painful... I'd rather not.

[pllim]

I opened follow-up issue at #2103