fix: fastify type issues

[smuthya]

There are type issues from fastify > 4.23.2. With changes in this pr, we are fixing below issues
fastify/fastify#5103
fastify/fastify@b59b0a5#diff-a22e7d603319a7f6d79163f6687b3d980db8627df7fcdcae09a087df9ea06a98L178

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}