lua: fix iconv memory leak
`ffi.C.tnt_iconv_open` returns pointer to `struct iconv`. In this case `__gc` in metatable is not bound to the object. Closes #10487 Part-of #10211 NO_TEST=covered by existing tests NO_DOC=bugfix (cherry picked from commit 105e6188ee6cc8de71ca2ab077f78f51be07559d)
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