MNT: Pin jsonschema maxversion

[pllim]

Description

This pull request is to pin maxversion of jsonschema because a new release broke asdf, which in turn broke our CI.

Once this is merged, we need to open a follow-up issue to unpin it when upstream is fixed.

Related: asdf-format/asdf#1171

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 change log needed? If yes, is it added to CHANGES.rst?
• Is a milestone set?
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

Merging #1573 (8fd7f83) into main (e4cfca4) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1573      +/-   ##
==========================================
+ Coverage   85.62%   85.64%   +0.02%     
==========================================
  Files          94       94              
  Lines        9209     9216       +7     
==========================================
+ Hits         7885     7893       +8     
+ Misses       1324     1323       -1     

Impacted Files	Coverage Δ
...plugins/spectral_extraction/spectral_extraction.py	88.93% <100.00%> (+0.69%)	⬆️

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[pllim]

LoL not sure why coverage increased but okay...

[kecnry]

Thanks!!