fs: accept non-32-bit length in writeBuffer

Since `length` is `size_t`, it can accept 64-bit integers too.

Refs: https://man7.org/linux/man-pages/man2/write.2.html
Fixes: https://github.com/nodejs/node/issues/36643

PR-URL: https://github.com/nodejs/node/pull/36667


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yash Ladha <yash@yashladha.in>
Reviewed-By: Zeyu Yang <himself65@outlook.com>