Correct name of code ready builder external on alma 9

The external CRB repo looks to have changed named between alma 8 and 9. Align EPEL tag create script on 9 to reality:

For eight prod:

rhel8-codeready-builder   http://linuxsoft.cern.ch/cern/rhel/8/codeready-builder/$arch/os/
rhel9-codeready-builder   http://linuxsoft.cern.ch/cern/rhel/9/codeready-builder/$arch/os/
rhel8-testing-codeready-builder http://linuxsoft.cern.ch/cern/rhel/8-testing/codeready-builder/$arch/os
rhel9-testing-codeready-builder http://linuxsoft.cern.ch/cern/rhel/9-testing/codeready-builder/$arch/os
rhel8-latest-codeready-builder http://linuxsoft.cern.ch/cern/rhel/.8-latest/codeready-builder/$arch/os/
rhel9-latest-codeready-builder http://linuxsoft.cern.ch/cern/rhel/.9-latest/codeready-builder/$arch/os/

For nine prod:

cs9-crb                   http://linuxsoft.cern.ch/cern/centos/s9/CRB/$arch/os/
cs9-testing-crb           http://linuxsoft.cern.ch/cern/centos/s9-testing/CRB/$arch/os/
cs9-latest-crb            http://linuxsoft.cern.ch/cern/centos/.s9-latest/CRB/$arch/os/
alma9-crb                 http://linuxsoft.cern.ch/cern/alma/9/CRB/$arch/os/
alma9-testing-crb         http://linuxsoft.cern.ch/cern/alma/9-testing/CRB/$arch/os/
alma9-latest-crb          http://linuxsoft.cern.ch/cern/alma/.9-latest/CRB/$arch/os/

More significantly:

$ koji -p prod taginfo alma9-defaults

External repos:
   30 alma9-baseos (http://linuxsoft.cern.ch/cern/alma/9/BaseOS/$arch/os/, merge mode: bare), arches: inherited from tag
   40 alma9-appstream (http://linuxsoft.cern.ch/cern/alma/9/AppStream/$arch/os/, merge mode: bare), arches: inherited from tag
   50 alma9-crb (http://linuxsoft.cern.ch/cern/alma/9/CRB/$arch/os/, merge mode: bare), arches: inherited from tag

Note that RHEL9 still uses rhel9-codeready-builder