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It is not a cyr2lat, but WordPress Core issue. Line 153 contains $this->features=array(); and property feature is not declared in the ftp class. Such a construction causes deprecation error in PHP 8.3.
As you can read here, WordPress 6.7 has only “beta support” of PHP 8.3.
To suppress deprecation errors from WordPress Core, plugins and themes, you can use my plugin KAGG Compatibility.