Update all dependencies of WCFS to their recent versions:

- go123: add support for go1.18 and go1.19
- neo: update to latest draft
- go-fuse: update to pick up https://github.com/hanwen/go-fuse/commit/4a0e6eb5
- ogórek: no change, just the version we already had was released as v1.2.0
- testify: some bugfixes (we use this package only during tests)

The following dependencies were not updated by upstream at all:

- glog
- overflow
- pkg/errors

.