Update 2D PBC ref values for finite bath

[basilib]

This updates the hard coded energy values for EWF calculations with a truncated bath to maintain compatibility with the latest version of pyscf (2.3).

It would be possible to also support older versions but I don't think that will be sustainable in the long run.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (bacf8d4) 0.00% compared to head (593a595) 0.00%.

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Additional details and impacted files

@@          Coverage Diff           @@
##           master    #115   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         138     138           
  Lines       18337   18372   +35     
======================================
- Misses      18337   18372   +35     

Impacted Files	Coverage Δ
vayesta/__init__.py	0.00% <0.00%> (ø)
vayesta/core/qemb/fragment.py	0.00% <0.00%> (ø)
vayesta/core/qemb/qemb.py	0.00% <ø> (ø)
vayesta/ewf/fragment.py	0.00% <0.00%> (ø)
vayesta/solver/ccsd.py	0.00% <0.00%> (ø)
vayesta/solver/fci.py	0.00% <0.00%> (ø)
vayesta/solver/solver.py	0.00% <0.00%> (ø)

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