Update dependency mem-fs to v4.1.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mem-fs	4.1.2 → 4.1.3

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Release Notes

SBoudrias/mem-fs (mem-fs)

v4.1.3

Compare Source

Fix - ensure directories return an empty Vinyl (contents: null)

On NetBSD 10 evbarm/aarch64 (Node v22.16.0), fs.readFileSync(dir) returns 4096 bytes instead of throwing EISDIR. This caused vinylFileSync(dir) to succeed, thus loadFile(dir) produced a File with non-null contents, and mem-fs-editor#exists(dir) would incorrectly returns true.

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