docs->add appsignal pino transport

[luismiramirez]

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Hi there! 👋🏼

We've created an AppSignal pino transport and recently released it as part of our v3.5.1 integration.

This PR adds the transport to the v7+ compatible list.

[mcollina]

is it covered by tests? does it have docs?

[luismiramirez]

is it covered by tests? does it have docs?

Yes, we have a test-setup for it working with Fastify Pino logging: https://github.com/appsignal/test-setups/blob/main/nodejs/fastify/app/src/app.ts

And its docs page: https://docs.appsignal.com/logging/platforms/integrations/nodejs.html#usage-with-pino