Bump AGNI to restore the SOCRATES thermal source-function grid

[timlichtenberg]

Description

Bump the AGNI pin from c7ffdf00 to 8a494d7c to restore the SOCRATES thermal source-function tabulation grid.

The nightly Integration tier fails on test_transparent_banded_olr_recovers_blackbody_emission: the banded transparent OLR at T_surf = 1500 K overshoots the black-body emission by about 0.073% (F_olr 287271.57 vs 287062.70 W/m^2, tolerance RTOL_SOCRATES = 5e-4), on both ubuntu and macos with an identical value, so it is not a toolchain effect. It traces to AGNI commit 66a61da0, which coarsened the prep_spec thermal source-function grid from a roughly 3.25 K step to a 25 K step; the coarser tabulation raises the banded-RT interpolation error enough to tip this tolerance. AGNI restored a finer grid upstream (ba7bec1e, then 8a494d7c at a 5 K step as a runtime-vs-accuracy compromise), so moving the pin forward to 8a494d7c recovers the accuracy while keeping the hydrostatic-integration and spin parameters that the previous pin bump added. The SOCRATES pin is unchanged and still satisfies AGNI's minimum-version check.

Validation of changes

Test configuration: Linux and macOS, Python 3.12, real SOCRATES spectral files.

Built AGNI at 8a494d7c and ran test_transparent_banded_olr_recovers_blackbody_emission: it passes over the full surface-temperature sweep (1000, 1500, 2000, 3000 K), all inside RTOL_SOCRATES. The full AGNI integration tier (-m 'integration and not slow') passes (44 of 44). The change to pyproject.toml is the single-line pin bump; the diff carries no other file. I confirmed by reverting only the thermal-grid constants in the previous pin that the test flips from failing to passing, which isolates the grid coarsening as the cause.

Checklist

• I have followed the contributing guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have checked that the tests still pass on my computer
• I have updated the docs, as appropriate
• I have added tests for these changes, as appropriate
• I have checked that all dependencies have been updated, as required

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.46%. Comparing base (30bec52) to head (8d10be2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #866   +/-   ##
=======================================
  Coverage   93.45%   93.46%           
=======================================
  Files         113      113           
  Lines       16797    16797           
  Branches     2992     2992           
=======================================
+ Hits        15698    15699    +1     
+ Misses       1093     1092    -1     
  Partials        6        6           

Flag	Coverage Δ
unit-tests	87.25% <ø> (+0.01%)	⬆️

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[egpbos]

This was a (partial?) duplicate of #863.