added changeset

Author: dotansimha

.changeset/improves_json_response_serialization.md

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+executor: patch
+router: patch
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+# Improve JSON response serialization
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+This PR significantly improves JSON response serialization (response projection) performance (50% faster) by replacing the existing character-by-character string escaping logic with a SIMD-accelerated implementation adapted from [sonic-rs](https://github.com/cloudwego/sonic-rs).