perf: remove find-up dependency, upgrade file-type dependency (#8195)

Fixes https://github.com/payloadcms/payload/issues/8111 and
https://github.com/payloadcms/payload/issues/8113

Before: 132 dependencies
After: 123 dependencies

This PR also contains a small performance optimization during telemetry
startup: By using the async `fs.promises.readFile` instead of
`readFileSync` we're not blocking the entire thread anymore and are
allowing other stuff to happen while the file is being read.
Also, in our dependency checker, this moves some variables out of loops,
to the module scope, as they only need to be calculated once.

We have to pin file-type to 19.3.0 and cannot upgrade it further (latest
is 19.5.0). See reasoning in
https://github.com/payloadcms/payload/issues/8111#issuecomment-2348119533

test/package.json

@@ -67,7 +67,7 @@
     "drizzle-kit": "0.23.2-df9e596",
     "eslint-plugin-playwright": "1.6.2",
     "execa": "5.1.1",
-    "file-type": "17.1.6",
+    "file-type": "19.3.0",
     "http-status": "1.6.2",
     "jwt-decode": "4.0.0",
     "lexical": "0.17.0",