Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

5.0.0

Plugin version

5.0.0

Node.js version

22.12.0

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

Ubuntu 24.04

Description

When launch generate-plugin create a nwe plugin it force the fastify version to ^4.0.0 while the fastfy version used is ^5.0.0

Link to code that reproduces the bug

https://github.com/gafreax/fastify-cli-incorrect-plugin-fastify-version

Expected Behavior

When using the fastify generate-plugin command, the generated plugin
template specifies a dependency on Fastify version ^4.0.0. However, my
project uses Fastify ^5.0.0 (or higher). This version mismatch leads to
errors during plugin installation and prevents the generated plugin from
working correctly with my existing application.

To reproduce:

1. Run `fastify generate-plugin <plugin-name>`
2. Observe the `package.json` file of the newly generated plugin.  It will

contain fastify@^4.0.0 as a dependency.

The error is:

> fastify start -w -l info -P app.js

FastifyError [Error]: fastify-plugin: index-auto-0 - expected '^4.x' fastify version, '5.2.1' is installed
    at Object.checkVersion (/home/gafz/Workspace/ex/node_modules/fastify/lib/pluginUtils.js:125:11)
    at Object.registerPlugin (/home/gafz/Workspace/ex/node_modules/fastify/lib/pluginUtils.js:148:16)
    at Boot.override (/home/gafz/Workspace/ex/node_modules/fastify/lib/pluginOverride.js:28:57)
    at Boot._loadPlugin (/home/gafz/Workspace/ex/node_modules/avvio/boot.js:425:25)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
  code: 'FST_ERR_PLUGIN_VERSION_MISMATCH',
  statusCode: 500
}