Switch fedora-latest to use fedora-34
Switch fedora-latest to use fedora-34

Fedora 32 is now EOL, we should test against the newly released
version of Fedora which is 34.

Depends-On: https://review.opendev.org/c/openstack/project-config/+/795604
Change-Id: I10d868aca20d1a10d3e7fcfeb78f6fda4c896ee8

openstack-dev/devstack,nawawi/openstack,openstack-dev/devstack,nawawi/openstack