chore: unpin pandera depencency in examples

[bagalaster]

Linked issue(s)

#629, #631

What change does this PR introduce and why?

Unpin pandera now that #631 is merged

Please check if the PR fulfills these requirements

• Include reference to internal ticket and/or GitHub issue "Fixes #NNNN" (if applicable)
• Relevant tests for the changes have been added
• Relevant docs have been added / updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.57%. Comparing base (e7d2036) to head (666b313).
Report is 1 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #632      +/-   ##
==========================================
- Coverage   94.48%   93.57%   -0.91%     
==========================================
  Files          86       86              
  Lines        5385     5385              
  Branches      790      790              
==========================================
- Hits         5088     5039      -49     
- Misses        220      259      +39     
- Partials       77       87      +10     

Flag	Coverage Δ
integration	76.21% <ø> (ø)

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[yifanwu-kolena]

seems like we should not commit this file