fix(aws-lambda): handle invalid header names in request processing (#4883)

* fix(aws-lambda): handle invalid header names in request processing

Co-authored-by: Taku Amano <taku@taaas.jp>

* ci: apply automated fixes

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Co-authored-by: Taku Amano <taku@taaas.jp>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>