Generated `compile_commands.json` is invalid on Unix systems

`\` characters are replaced with `/` because MSBuild thinks they're path separators, resulting in invalid JSON... https://github.com/vezel-dev/zig-sdk/blob/03f8cb5cfd66d13bc5797813140a09bb30ef8a37/src/sdk/build/Vezel.Zig.Sdk.Editor.targets#L46-L65