Updating for v5

[nrayburn-tech]

Prerequisites

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

Issue

I'm looking to update this repo for v5. fastify/fastify#5116

Changes Needed (Please let me know if anything might be missing)

• Pin tap to 16.3.9
• Update workflows to use v4 (temporarily pointing directly to a git sha)
• Update engines in package.json to >= 18 Remove engines from package.json
• Update dependabot config to ignore major tap versions

[jsumners]

• Update engines in package.json to >= 18

My personal opinion is to remove the engines field completely. It is ignored by package managers except to maybe log a warning in the middle of output basically no one reads. But maybe others from @fastify/core have a different opinion.

[metcoder95]

If it weren't because the warning log gets missed quite easily when installing, I'd say it provides good feedback to the user. But as it is not forced, and anyway fp enforces already specific versions of fastify; that should be enough. So +1 on drop it

[nrayburn-tech]

Updated the PR, but I think I'm going to leave it as a draft until the workflow v4 tag is available unless there's a reason to merge it in sooner. (Going to follow the same pattern for my other PRs of just leaving them as a draft too.)

[gurgunday]

I just saw the issue, sorry for taking over!

There are many other repositories available to do an upgrade, so it would still be amazing if you could help!