fix: support cookie v2.x

[Tony133]

Proposal:

• Updates the test suite's use of cookie to work with cookie v2.x. cookie v2 removed the parse(str, opts) export. Three test files (touch.test.js, path.test.js, delete.test.js) used cookie.parse() on a Set-Cookie response header as an informal way to inspect its attributes, which threw cookie.parse is not a function (3 failing tests, see here: https://github.com/fastify/fastify-secure-session/actions/runs/28617250962/job/84864018405?pr=296#step:5:74).

Note:

• This PR should resolved this PR: chore: bump cookie from 1.1.1 to 2.0.0 #296

[Eomm]

We must release it as major since node.js 20 is no more supported

[climba03003]

We must release it as major since node.js 20 is no more supported

Not really, require(ESM) is support by node@20.17.0.
We actually only support (or test against) the latest version of each major version.
If it is not supported, the CI will throw red signal.

[Eomm]

Ok, but I'm not talking about CI green/red, but about support: now the cookie v2 team can land something that is not included in node20.x.

If the CI turns read, it means users will have red CIs as well and we will need to:

• pin the prev v2 version
• rollback this PR

We will handle in case.