mypy

b995e162 - Rebind self-types in subclass methods without Self annotation (#15541)

Rebind self-types in subclass methods without Self annotation (#15541) Fixes #15529 The fix is straightforward, hopefully there will be no fallout. (Note that #14075 would also fix this, but I am still not sure we should do that) --------- Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>