fix: fixed key escaping in OrderedItems marshaling

[fredbi]

• fixes OrderSchemaItems.MarshalJSON generates invalid JSON when keys contain special characters (e.g. newline) #216

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 52.38095% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.22%. Comparing base (e64b092) to head (0a376bf).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
properties.go	52.38%	5 Missing and 5 partials ⚠️

❌ Your patch status has failed because the patch coverage (52.38%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
- Coverage   67.45%   67.22%   -0.24%     
==========================================
  Files          30       30              
  Lines        2397     2407      +10     
==========================================
+ Hits         1617     1618       +1     
- Misses        616      621       +5     
- Partials      164      168       +4     

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