Upgrade to platform-fastify v9

[sam-super]

Is there an existing issue that is already proposing this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe it

Because it would be nice to use a more modern versions of fastify and also to get rid of this warning:

(node:78725) [FST_MODULE_DEP_FASTIFY-FORMBODY] FastifyWarning.fastify-formbody: fastify-formbody has been deprecated. Use @fastify/formbody@6.0.0 instead.

Describe the solution you'd like

For @nestjs/apollo to be made compatible with @nestjs/platform-fastify at v9.

Teachability, documentation, adoption, migration strategy

No response

What is the motivation / use case for changing the behavior?

Being an outdated version of fastify (and platform-fastify) isn't great for the security and the health of the project in general (the further we get, the harder the upgrades will be).

From what i understand:

1. @nestjs/platform-fastify: fastify version mismatch Apollo v3 requirements #2307 (comment)

Fastify v4 cannot be used with apollo-server-fastify v3. If you're using Fastify + NestJS + Apollo, I'd suggest not upgrading to v9 just yet

2. apollo-server is relying on community modules to support fastify integration (since v4):
   https://github.com/apollographql/apollo-server/releases/tag/%40apollo%2Fserver%404.0.0 (See Removed web framework integrations)

3. for @nestjs/graphql to support fastify v4 we would need to integrate with another library to support apollo-server with fastify v4.
   There are some recommended libs for this:
   https://www.apollographql.com/docs/apollo-server/integrations/integration-index/
   https://www.npmjs.com/package/@as-integrations/fastify

(Apologies if i have misunderstood any of this, or if it is already on a roadmap, but i just wanted to check).

[kamilmysliwiec]

We're already tracking this here #2307 (comment) and here #2445