setup: bump ossfs==2021.7.5

[isidentical]

No description provided.

[karajan1001]

Any better methods to test this?

dvc/tests/unit/remote/test_oss.py

Lines 19 to 21 in 6c8673b

	assert fs.fs._endpoint == endpoint
	assert fs.fs._auth.id == key_id
	assert fs.fs._auth.secret == key_secret

is somewhat useless. Maybe we should delete them?

[isidentical]

is somewhat useless. Maybe we should delete them?

We can just use fs_args.

[isidentical]

CC: @karajan1001