remove upper pin on BayesicFitting

[zacharyburnett]

This PR unpins the upper pin on BayesicFitting from #7435 to test if the import errors have now been fixed

Checklist for maintainers

• [N/A] added entry in CHANGES.rst within the relevant release section
• [N/A] updated or added relevant tests
• [N/A] updated relevant documentation
• [N/A] added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• [N/A] Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9e3a2c4) 77.42% compared to head (8d6765c) 77.42%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7529   +/-   ##
=======================================
  Coverage   77.42%   77.42%           
=======================================
  Files         452      452           
  Lines       36241    36241           
=======================================
  Hits        28060    28060           
  Misses       8181     8181           

Flag	Coverage Δ
nightly	77.43% <ø> (ø)

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[hbushouse]

All CI tests have passed, so I guess that means the latest version is now OK?

[zacharyburnett]

I'll run a regression test as well, standby - https://plwishmaster.stsci.edu:8081/blue/organizations/jenkins/RT%2FJWST-Developers-Pull-Requests/detail/JWST-Developers-Pull-Requests/637/pipeline/