Unable to install fleetspeak-client-bin (0.1.11) on ppc64le

**Environment**
- How did you install GRR? [e.g. from release DEB, HEAD DEB, PIP package, source]
PIP package/source
- What GRR version are you running?: [e.g. 3.1.2.3]
3.4.5.1
- What operating system does the GRR server run on? [e.g. Ubuntu 18.04]
Debian 11 (Bullseye) (ppc64le)
- What operating system does the affected GRR client run on, if applicable? [e.g. Windows 10]
-

**Describe the issue**
Trying to install GRR Server from pip packages or via source, I am not able to install fleetspeak-client-bin version 0.1.11 on a ppc64le architecture.

Steps to reproduce:
`pip3 install fleetspeak-client-bin `

**Error logs**
```
ERROR: Could not find a version that satisfies the requirement fleetspeak-client-bin
ERROR: No matching distribution found for fleetspeak-client-bin
```

**Additional context**
There is a working (old) version of GRR Server (ppc64el) at https://packages.ubuntu.com/bionic/grr-server for Ubuntu 18.04.