build(deps): update dependency mem-fs to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mem-fs	2.3.0 → 4.1.3

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Release Notes

SBoudrias/mem-fs (mem-fs)

v4.1.3

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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.

v4.1.2

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What's Changed

• fix: replace Duplex with a Transform by @​mshima in #​40

Full Changelog: SBoudrias/mem-fs@v4.1.1...v4.1.2

v4.1.1

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• have a permissive node version (#​39) 2f459dd

v4.1.0

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• add resolveConflict option (#​38) d0547fe

v4.0.0

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• emit events on pipeline refresh (#​34) cbdbc08

v3.0.0

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The mem-fs package now export a native ESM module. (Learn more about ESM)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.03%. Comparing base (6fb8d60) to head (557eb0e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   59.03%   59.03%           
=======================================
  Files          11       11           
  Lines         166      166           
=======================================
  Hits           98       98           
  Misses         68       68           

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