Node 16 is EOL this year (2023/09/11 per https://github.com/nodejs/release#release-schedule), see https://docs.netlify.com/functions/optional-configuration/?fn-language=ts#node-js-version-for-runtime for how to run the Netlify function in Node 18.
Node 16 is EOL this year (2023/09/11 per https://github.com/nodejs/release#release-schedule), see https://docs.netlify.com/functions/optional-configuration/?fn-language=ts#node-js-version-for-runtime for how to run the Netlify function in Node 18.