CI: tox -e safety broken due to major release 3 of safety

`tox -e safety` wity package `saftety` not pinned to 2.x does not work and fails with 
```
Error: No such option: --disable-telemetry Did you mean --disable-optional-telemetry?
```
- [ ] Quick fix: Pin saftey to 2.3.5, the latest 2.x release #2004
- [ ] Long term fix: Update call of saftey to work with 3.x