Fix typing for artifact schemas

[nakamichiworks]

resolves #10442

Problem

Types of artifact schemas decorated with @schema_version() are incorrectly inferred to be VersionedSchema.

Solution

Fixes a type hint in schema_version() function.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (6e4564a) to head (411c4e9).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10443      +/-   ##
==========================================
- Coverage   88.81%   88.80%   -0.02%     
==========================================
  Files         180      180              
  Lines       22573    22574       +1     
==========================================
- Hits        20049    20046       -3     
- Misses       2524     2528       +4     

Flag	Coverage Δ
integration	86.07% <100.00%> (-0.12%)	⬇️
unit	62.18% <100.00%> (+<0.01%)	⬆️

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Components	Coverage Δ
Unit Tests	62.18% <100.00%> (+<0.01%)	⬆️
Integration Tests	86.07% <100.00%> (-0.12%)	⬇️