There are some dependencies that still depends on the unmaintained bolt after
https://github.com/seaweedfs/seaweedfs/pull/3554. Replace it so that we can
have one less dependency, and build on newer architecture like RISC-V.
Two lines of `replace` are required because Go refuses to replace
`github.com/boltdb/bolt` with `go.etcd.io/bbolt` when the latter is also
present in the dependency tree. Replace it again with
`github.com/etcd-io/bbolt` solves the issue.