[backend] Revert "[deps] Update dependency zod to v4 (#12784)" (#14763)

[lndrtrbn]

This reverts commit 85ae6c4.

Closes #14763

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 32.37%. Comparing base (4a42577) to head (f3e27fb).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../opencti-graphql/src/modules/theme/theme-domain.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #14761   +/-   ##
=======================================
  Coverage   32.37%   32.37%           
=======================================
  Files        3098     3098           
  Lines      211033   211033           
  Branches    38245    38245           
=======================================
+ Hits        68312    68315    +3     
+ Misses     142721   142718    -3     

Flag	Coverage Δ
opencti-client-python	45.48% <ø> (ø)
opencti-front	2.83% <ø> (ø)
opencti-graphql	67.74% <87.50%> (+<0.01%)	⬆️

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[fellowseb]

Related issue: #12161