metadata for release 1.15.1 (B11.0rc2)

[zacharyburnett]

regtest running at https://github.com/spacetelescope/RegressionTests/actions/runs/9812819013

[nden]

Please add this release to the README.
Probably worth making an entry in the CHANGES file saying something like

ramp_fitting:
- Fix bugs in the C algorithm Poisson variance calculation when provided with an average dark current. [stcal#269]

- Use the C extension with multiprocessing. [stcal#268]

Is requirements-sdp updated on the release branch?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.56%. Comparing base (d02ac25) to head (8797df6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8629   +/-   ##
=======================================
  Coverage   59.56%   59.56%           
=======================================
  Files         391      391           
  Lines       39285    39285           
=======================================
  Hits        23402    23402           
  Misses      15883    15883           

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[zacharyburnett]

Is requirements-sdp updated on the release branch?

Not yet, I'll update that when doing the release

[zacharyburnett]

changing the scope of this PR to release metadata generally