dist/Dockerfile: bump base image to Fedora 36

[lucab]

This updates the container base image to Fedora 36.

[jmarrero]

lgtm

[lucab]

Unfortunately this brought some troubles to the production deployment, with police-engine not able to serve most of the requests.
Clients were seeing a lot of timeouts from the production endpoint, error counters started going up right after deploying this:

# HELP zincati_cincinnati_update_checks_errors_total Total number of errors while checking for updates.
# TYPE zincati_cincinnati_update_checks_errors_total counter
zincati_cincinnati_update_checks_errors_total{kind="generic_http_408"} 147
zincati_cincinnati_update_checks_errors_total{kind="generic_http_504"} 146

I'll have to revert this PR then try attempting smaller image bumps.