BUG #16748: postgis30_13 installation broken

The following bug has been logged on the website:

Bug reference:      16748
Logged by:          Patrik Uytterhoeven
Email address:      patrik@open-future.be
PostgreSQL version: 13.1
Operating system:   CentOS 8
Description:

dnf install postgis30_13 
will fail with a confict between proj71 and 72
as it turns out it will try to install both
proj71                                                     x86_64
                     7.1.1-2.rhel8
          PostgreSQL-Common                                 2.2 M
proj72                                                     x86_64
                     7.2.0-2.rhel8
          PostgreSQL-Common                                 2.5 M



Error: Transaction test error:
  file /usr/proj72/bin/cct conflicts between attempted installs of
proj72-0:7.2.0-2.rhel8.x86_64 and proj71-0:7.1.1-2.rhel8.x86_64
  file /usr/proj72/bin/cs2cs conflicts between attempted installs of
proj72-0:7.2.0-2.rhel8.x86_64 and proj71-0:7.1.1-2.rhel8.x86_64
  file /usr/proj72/bin/geod conflicts between attempted installs of
proj72-0:7.2.0-2.rhel8.x86_64 and proj71-0:7.1.1-2.rhel8.x86_64