Current instructions point to absent gpg key

README.md instructs:

`CRIO_VERSION=v1.35`

and:

```bash
curl -fsSL https://download.opensuse.org/repositories/isv:/cri-o:/stable:/$CRIO_VERSION/deb/Release.key |
    gpg --dearmor -o /etc/apt/keyrings/cri-o-apt-keyring.gpg
```

However the resulting URL (which is `https://download.opensuse.org/repositories/isv:/cri-o:/stable:/v1.35/deb/Release.key`) returns a 404 at present.