fix: exclude explicit casts when source type is object

[latonz]

No description provided.

[codecov-commenter]

Codecov Report

Merging #400 (34bd6d2) into main (e5e2d1c) will increase coverage by 0.12%.
The diff coverage is 82.90%.

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@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   91.73%   91.85%   +0.12%     
==========================================
  Files         126      130       +4     
  Lines        3931     4112     +181     
  Branches      548      568      +20     
==========================================
+ Hits         3606     3777     +171     
- Misses        214      221       +7     
- Partials      111      114       +3     

Impacted Files	Coverage Δ
src/Polyfills/Nullable.cs	0.00% <0.00%> (ø)
...k.Mapperly.Abstractions/MapDerivedTypeAttribute.cs	0.00% <0.00%> (ø)
...ok.Mapperly/Configuration/AttributeDataAccessor.cs	73.33% <66.66%> (-1.67%)	⬇️
src/Riok.Mapperly/Emit/SyntaxFactoryHelper.cs	95.35% <93.93%> (-0.23%)	⬇️
src/Riok.Mapperly/Configuration/MapDerivedType.cs	100.00% <100.00%> (ø)
src/Riok.Mapperly/Descriptors/Configuration.cs	95.00% <100.00%> (ø)
...Riok.Mapperly/Descriptors/MappingBuilderContext.cs	98.11% <100.00%> (+0.03%)	⬆️
...ptors/MappingBuilders/DerivedTypeMappingBuilder.cs	100.00% <100.00%> (ø)
.../Descriptors/MappingBuilders/EnumMappingBuilder.cs	97.89% <100.00%> (+1.40%)	⬆️
...tors/MappingBuilders/ExplicitCastMappingBuilder.cs	100.00% <100.00%> (ø)
... and 4 more

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[github-actions]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

• GitHub release
• v3.0.0

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