Fix syntax error in types_generator.rb

[oott123]

Fix syntax errors in types-generator/lib/types_generator.rb:

• Replace object.merge(returnType:) with object.merge!(returnType: returnType) on line 60.
• Replace object.merge(fields:, extends:) with object.merge!(fields: fields, extends: extends) on line 61.
• Add end at the end of the file.

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[oott123]

Fix syntax error in types-generator/lib/types_generator.rb

• Add missing end statement at the end of the file to resolve the syntax error.

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