fix(minor-voting-verifier): remove old migration handler

[cjcobb23]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.50%. Comparing base (9f91b1e) to head (c6528b6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
contracts/voting-verifier/src/contract.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #693      +/-   ##
==========================================
- Coverage   93.55%   93.50%   -0.06%     
==========================================
  Files         237      236       -1     
  Lines       35343    35181     -162     
==========================================
- Hits        33066    32896     -170     
- Misses       2277     2285       +8     

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[cgorenflo]

I think the current version should still be checked, so it's not possible to accidentally (or maliciously) roll back to this from whichever version we have

see comment