do not require schema version on manifest handler

[lkostrowski]

• restore schema version to be optional
• fix bug with parsing saleor schema version to float

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.40%. Comparing base (126493d) to head (562ff3b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
- Coverage   83.44%   83.40%   -0.05%     
==========================================
  Files          98       98              
  Lines        3450     3441       -9     
  Branches      592      588       -4     
==========================================
- Hits         2879     2870       -9     
  Misses        560      560              
  Partials       11       11              

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[changeset-bot]

🦋 Changeset detected

Latest commit: 562ff3b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@saleor/app-sdk	Patch

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[github-actions]

Released snapshot build with @dev tag in npm with version: 0.0.0-pr-20250226090519.

Install it with:

pnpm add @saleor/app-sdk@0.0.0-pr-20250226090519

[github-actions]

Released snapshot build with @dev tag in npm with version: 0.0.0-pr-20250226101433.

Install it with:

pnpm add @saleor/app-sdk@0.0.0-pr-20250226101433