Regenerate the asyncio client with openapi-generator 7.25.0

Keeps the asyncio client on the same generator release as the
synchronous one, as requested on #2681.

Regenerate client_go_retry_asyncio_patch.diff with context lines and
drop --unidiff-zero. Its hunks were pure insertions at fixed offsets,
so generator drift above them moves the insertion point while git apply
still reports success.