Fixing a 'that' vs. 'which' mistake in error about bounds crossing

[emma58]

Fixes # .

Summary/Motivation:

One-word change to fix a grammar mistake in an error message.

Changes proposed in this PR:

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (1cb37aa) 87.82% compared to head (a63689c) 87.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2950      +/-   ##
==========================================
- Coverage   87.82%   87.81%   -0.02%     
==========================================
  Files         770      770              
  Lines       89654    89640      -14     
==========================================
- Hits        78741    78719      -22     
- Misses      10913    10921       +8     

Flag	Coverage Δ
linux	84.87% <ø> (+<0.01%)	⬆️
osx	74.57% <ø> (-0.01%)	⬇️
other	85.04% <ø> (ø)
win	82.11% <ø> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
pyomo/contrib/fbbt/fbbt.py	96.96% <ø> (ø)

... and 15 files with indirect coverage changes

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