fix: Bump formidable version to ^3.5.4

Although it doesn't explicitly state it, [email protected] uses os.machine
(https://nodejs.org/api/os.html#osmachine) that was introduced in Node.js 18.9.0
(and then backported to 16.18.0).

Since superagent should support Node.js 14.18.0 and above, it cannot use this
new version of formidable. Bumping the requirement to ^3.5.4 solves this issue.

Fixes #1831

Author: bd-allon

package.json

@@ -23,7 +23,7 @@
     "debug": "^4.3.4",
     "fast-safe-stringify": "^2.1.1",
     "form-data": "^4.0.0",
-    "formidable": "^3.5.2",
+    "formidable": "^3.5.4",
     "methods": "^1.1.2",
     "mime": "2.6.0",
     "qs": "^6.11.0"