Update all dependencies of WCFS to their recent versions:

- neo/go: Update to pick up support for NEO/go to handle multiple master nodes
- go123: Add support for Go1.21

The following dependencies were updated, but depend on higher go
versions than supported by wendelin.core

- glog: v1.1.0 needs go 1.19, but we still support go 1.18

The following dependencies were not updated by upstream at all:

- overflow
- og-rek
- errors
- testify

/reviewed-by @kirr
/reviewed-on nexedi/wendelin.core!22