[mimalloc] update to v2.2.4

[Copilot]

This PR updates the mimalloc library from version 2.2.3 to 2.2.4.

Changes Made

• Updated vcpkg.json version from "2.2.3" to "2.2.4" and reset port-version to 0
• Updated SHA512 hash in portfile.cmake for the v2.2.4 source archive
• Added new version entry to versions/m-/mimalloc.json with calculated git-tree hash
• Updated versions/baseline.json to reflect the new baseline version

Release Notes

According to the mimalloc release notes, v2.2.4 includes:

• Important bug fixes, including a case where OS memory was not always fully released
• Improved v3 performance
• Build fixes for XBox and Android
• Support for interpose on older macOS versions
• Use MADV_FREE_REUSABLE on macOS
• Always check commit success
• Better support for Windows fixed TLS offset

Testing

• Successfully built and installed mimalloc v2.2.4 on x64-linux
• Verified package contains all expected files (headers, static libraries)
• Confirmed version number in header matches v2.2.4 (MI_MALLOC_VERSION = 224)

Fixes #45949.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/microsoft/mimalloc/git/refs/heads/master
  • Triggering command: curl --fail --retry 3 -L REDACTED --create-dirs --output microsoft-mimalloc-master.version.3517.part -H User-Agent: vcpkg/2025-06-02-145689e84b7637525510e2c9b4ee603fda046b56 (curl) (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[Copilot]

Format the vcpkg.json using vcpkg format-manifest.

Formatted the vcpkg.json file using vcpkg format-manifest command. The formatting removed the explicit "port-version": 0 field since it's the default value. (7bdd646)