Bump Pytensor dependency

[ricardoV94]

Trying to use a minimum version range, so we don't need to update for bugfixes... WDYT?

Marking this as major as the Latex/Str representation of the variables now use the long name due/thanks to #244

---

📚 Documentation preview 📚: https://pymc--6665.org.readthedocs.build/en/6665/

[codecov]

Codecov Report

Merging #6665 (f466fcb) into main (5d68bf3) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6665      +/-   ##
==========================================
- Coverage   91.97%   91.97%   -0.01%     
==========================================
  Files          94       94              
  Lines       15942    15942              
==========================================
- Hits        14663    14662       -1     
- Misses       1279     1280       +1     

Impacted Files	Coverage Δ
pymc/distributions/continuous.py	97.70% <100.00%> (ø)
pymc/distributions/dist_math.py	87.91% <100.00%> (ø)
pymc/distributions/multivariate.py	92.21% <100.00%> (ø)
pymc/logprob/transforms.py	95.67% <100.00%> (-0.21%)	⬇️
pymc/model.py	90.03% <100.00%> (ø)

[twiecki]

E FutureWarning: sgn is deprecated and will stop working in the future, use sign instead.