Remove macOS and FreeBSD OS classifiers

[Copilot]

pyfuse3 depends on libfuse3 which is Linux-only. The package does not build on macOS or FreeBSD (see #14, #103), yet pyproject.toml declares support for these platforms.

Changes

• Removed "Operating System :: MacOS :: MacOS X" classifier
• Removed "Operating System :: POSIX :: BSD :: FreeBSD" classifier
• Retained "Operating System :: POSIX :: Linux" classifier

This aligns package metadata with actual platform compatibility.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>remove macOS and FreeBSD compatibility metadata</issue_title>
<issue_description>pyproject.toml declares:

    "Operating System :: POSIX :: Linux",
    "Operating System :: MacOS :: MacOS X",
    "Operating System :: POSIX :: BSD :: FreeBSD",

Considering #14 and #103, I think macOS and FreeBSD should be removed there - it does not even build on these OSes.</issue_description>

<agent_instructions>Update pyproject.toml as requested.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@ThomasWaldmann This is btw. kind of a regression, considering that `pyfuse3` predecessor `llfuse` works on these systems. @Nikratio Yeah, these classifiers are not a great fit to describe pyfuse3. It doesn't have any OS-dependence itself, it runs wherever libfuse3 runs. But we should try to get approximately right.

• Fixes remove macOS and FreeBSD compatibility metadata #121

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