[ANNOUNCE] blktests repoistory move

[Shinichiro Kawasaki]

Hello all,

FYI, as a preparation to set up blktests CI, we are going to move the blktests
repository,

 from: https://github.com/osandov/blktests
 to:   https://github.com/linux-blktests/blktests

The move is planned early next week, around May/27.

The move will be served by the GitHub repository transfer feature [1], so no
impact is expected for blktests users. Old repository addresses should be usable
after the move since they are redirected to the new repository. Just to avoid
confusion, it is recommended to update the remote URLs in your local clones
after the move.

[1] https://docs.github.com/en/repositories/creating-and-managing-repositories/transferring-a-repository