go-bs-autobatch can't be built due to undefined blockstore.ErrNotFound

[fbac]

go-bs-autobatch can't be built due to undefined blockstore.ErrNotFound functions called:

# github.com/application-research/go-bs-autobatch
../../../go/pkg/mod/github.com/application-research/go-bs-autobatch@v0.0.0-20211215020302-c4c0b68ef402/autobatch.go:216:34: undefined: blockstore.ErrNotFound
../../../go/pkg/mod/github.com/application-research/go-bs-autobatch@v0.0.0-20211215020302-c4c0b68ef402/autobatch.go:238:34: undefined: blockstore.ErrNotFound
../../../go/pkg/mod/github.com/application-research/go-bs-autobatch@v0.0.0-20211215020302-c4c0b68ef402/autobatch.go:395:33: undefined: blockstore.ErrNotFound

Additional context
blockstore changed its way to raise ErrNotFound since this PR, which breaks compatibility.

The logic should be changed to use ipld.ErrNotFound instead of blockstore.ErrNotFound.

[alvin-reyes]

Resolved by the latest release here

https://github.com/application-research/go-bs-autobatch/releases/tag/v0.1.0