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docs(golang): remove unused pkg (#5473) #8309

Job	Run time
build-c-doc	16s
build-cpp-doc	23s
build-dav-server-opendalfs-doc	52s
build-fuse3-opendal-doc	46s
build-haskell-doc	2m 28s
build-java-doc	18s
build-nodejs-doc	18s
build-lua-doc	14s
build-object-store-opendal-doc	45s
build-ocaml-doc	4m 32s
build-opendal-compat-doc	44s
build-parquet-opendal-doc	45s
build-rust-doc	3m 31s
build-unftp-sbe-opendal-doc	1m 18s
build-python-doc	3m 6s
build-virtiofs-opendal-doc	49s
build-website	1m 41s
	22m 46s

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